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49 results on '"Fuhrmeister A"'

2. CARMENES input catalog of M dwarfs

Author

Shan, Y., primary, Revilla, D., additional, Skrzypinski, S. L., additional, Dreizler, S., additional, Béjar, V. J. S., additional, Caballero, J. A., additional, Cardona Guillén, C., additional, Cifuentes, C., additional, Fuhrmeister, B., additional, Reiners, A., additional, Vanaverbeke, S., additional, Ribas, I., additional, Quirrenbach, A., additional, Amado, P. J., additional, Aceituno, F. J., additional, Casanova, V., additional, Cortés-Contreras, M., additional, Dubois, F., additional, Gorrini, P., additional, Henning, Th., additional, Herrero, E., additional, Jeffers, S. V., additional, Kemmer, J., additional, Lalitha, S., additional, Lodieu, N., additional, Logie, L., additional, López González, M. J., additional, Martín-Ruiz, S., additional, Montes, D., additional, Morales, J. C., additional, Nagel, E., additional, Pallé, E., additional, Perdelwitz, V., additional, Pérez-Torres, M., additional, Pollacco, D., additional, Rau, S., additional, Rodríguez-López, C., additional, Rodríguez, E., additional, Schöfer, P., additional, Seifert, W., additional, Sota, A., additional, Zapatero Osorio, M. R., additional, and Zechmeister, M., additional

Published
2024
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3. GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth

Author

Palle, E., primary, Orell-Miquel, J., additional, Brady, M., additional, Bean, J., additional, Hatzes, A. P., additional, Morello, G., additional, Morales, J. C., additional, Murgas, F., additional, Molaverdikhani, K., additional, Parviainen, H., additional, Sanz-Forcada, J., additional, Béjar, V. J. S., additional, Caballero, J. A., additional, Sreenivas, K. R., additional, Schlecker, M., additional, Ribas, I., additional, Perdelwitz, V., additional, Tal-Or, L., additional, Pérez-Torres, M., additional, Luque, R., additional, Dreizler, S., additional, Fuhrmeister, B., additional, Aceituno, F., additional, Amado, P. J., additional, Anglada-Escudé, G., additional, Caldwell, D. A., additional, Charbonneau, D., additional, Cifuentes, C., additional, de Leon, J. P., additional, Collins, K. A., additional, Dufoer, S., additional, Espinoza, N., additional, Essack, Z., additional, Fukui, A., additional, Chew, Y. Gómez Maqueo, additional, Gómez-Muñoz, M. A., additional, Henning, Th., additional, Herrero, E., additional, Jeffers, S.V., additional, Jenkins, J., additional, Kaminski, A., additional, Kasper, J., additional, Kunimoto, M., additional, Latham, D., additional, Lillo-Box, J., additional, López-González, M. J., additional, Montes, D., additional, Mori, M., additional, Narita, N., additional, Quirrenbach, A., additional, Pedraz, S., additional, Reiners, A., additional, Rodríguez, E., additional, Rodríguez-López, C., additional, Sabin, L., additional, Schanche, N., additional, Schwarz, R.-P., additional, Schweitzer, A., additional, Seifahrt, A., additional, Stefansson, G., additional, Sturmer, J., additional, Trifonov, T., additional, Vanaverbeke, S., additional, Wells, R. D., additional, Zapatero-Osorio, M. R., additional, and Zechmeister, M., additional

Published
2023
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4. The CARMENES search for exoplanets around M dwarfs. Behaviour of the Paschen lines during flares and quiescence

Author

Fuhrmeister, B., primary, Czesla, S., additional, Schmitt, J. H. M. M., additional, Schneider, P. C., additional, Caballero, J. A., additional, Jeffers, S. V., additional, Nagel, E., additional, Montes, D., additional, Gálvez Ortiz, M. C., additional, Reiners, A., additional, Ribas, I., additional, Quirrenbach, A., additional, Amado, P. J., additional, Henning, Th., additional, Lodieu, N., additional, Martín-Fernández, P., additional, Morales, J. C., additional, Schöfer, P., additional, Seifert, W., additional, and Zechmeister, M., additional

Published
2023
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6. The CARMENES search for exoplanets around M dwarfs

Author

Ribas, I., primary, Reiners, A., additional, Zechmeister, M., additional, Caballero, J. A., additional, Morales, J. C., additional, Sabotta, S., additional, Baroch, D., additional, Amado, P. J., additional, Quirrenbach, A., additional, Abril, M., additional, Aceituno, J., additional, Anglada-Escudé, G., additional, Azzaro, M., additional, Barrado, D., additional, Béjar, V. J. S., additional, Benítez de Haro, D., additional, Bergond, G., additional, Bluhm, P., additional, Calvo Ortega, R., additional, Cardona Guillén, C., additional, Chaturvedi, P., additional, Cifuentes, C., additional, Colomé, J., additional, Cont, D., additional, Cortés-Contreras, M., additional, Czesla, S., additional, Díez-Alonso, E., additional, Dreizler, S., additional, Duque-Arribas, C., additional, Espinoza, N., additional, Fernández, M., additional, Fuhrmeister, B., additional, Galadí-Enríquez, D., additional, García-López, A., additional, González-Álvarez, E., additional, González Hernández, J. I., additional, Guenther, E. W., additional, de Guindos, E., additional, Hatzes, A. P., additional, Henning, Th., additional, Herrero, E., additional, Hintz, D., additional, Huelmo, Á. L., additional, Jeffers, S. V., additional, Johnson, E. N., additional, de Juan, E., additional, Kaminski, A., additional, Kemmer, J., additional, Khaimova, J., additional, Khalafinejad, S., additional, Kossakowski, D., additional, Kürster, M., additional, Labarga, F., additional, Lafarga, M., additional, Lalitha, S., additional, Lampón, M., additional, Lillo-Box, J., additional, Lodieu, N., additional, López González, M. J., additional, López-Puertas, M., additional, Luque, R., additional, Magán, H., additional, Mancini, L., additional, Marfil, E., additional, Martín, E. L., additional, Martín-Ruiz, S., additional, Molaverdikhani, K., additional, Montes, D., additional, Nagel, E., additional, Nortmann, L., additional, Nowak, G., additional, Pallé, E., additional, Passegger, V. M., additional, Pavlov, A., additional, Pedraz, S., additional, Perdelwitz, V., additional, Perger, M., additional, Ramón-Ballesta, A., additional, Reffert, S., additional, Revilla, D., additional, Rodríguez, E., additional, Rodríguez-López, C., additional, Sadegi, S., additional, Sánchez Carrasco, M. Á., additional, Sánchez-López, A., additional, Sanz-Forcada, J., additional, Schäfer, S., additional, Schlecker, M., additional, Schmitt, J. H. M. M., additional, Schöfer, P., additional, Schweitzer, A., additional, Seifert, W., additional, Shan, Y., additional, Skrzypinski, S. L., additional, Solano, E., additional, Stahl, O., additional, Stangret, M., additional, Stock, S., additional, Stürmer, J., additional, Tabernero, H. M., additional, Tal-Or, L., additional, Trifonov, T., additional, Vanaverbeke, S., additional, Yan, F., additional, and Zapatero Osorio, M. R., additional

Published
2023
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7. The CARMENES search for exoplanets around M dwarfs

Author

Schöfer, P., primary, Jeffers, S. V., additional, Reiners, A., additional, Zechmeister, M., additional, Fuhrmeister, B., additional, Lafarga, M., additional, Ribas, I., additional, Quirrenbach, A., additional, Amado, P. J., additional, Caballero, J. A., additional, Anglada-Escudé, G., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Cortés-Contreras, M., additional, Alonso, E. Díez, additional, Dreizler, S., additional, Guenther, E. W., additional, Herbort, O., additional, Johnson, E. N., additional, Kaminski, A., additional, Kürster, M., additional, Montes, D., additional, Morales, J. C., additional, Pedraz, S., additional, and Tal-Or, L., additional

Published
2022
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9. Magnetism, rotation, and nonthermal emission in cool stars

Author

Reiners, A., primary, Shulyak, D., additional, Käpylä, P. J., additional, Ribas, I., additional, Nagel, E., additional, Zechmeister, M., additional, Caballero, J. A., additional, Shan, Y., additional, Fuhrmeister, B., additional, Quirrenbach, A., additional, Amado, P. J., additional, Montes, D., additional, Jeffers, S. V., additional, Azzaro, M., additional, Béjar, V. J. S., additional, Chaturvedi, P., additional, Henning, Th., additional, Kürster, M., additional, and Pallé, E., additional

Published
2022
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11. The CARMENES search for exoplanets around M dwarfs

Author

Fuhrmeister, B., primary, Czesla, S., additional, Nagel, E., additional, Reiners, A., additional, Schmitt, J. H. M. M., additional, Jeffers, S. V., additional, Caballero, J. A., additional, Shulyak, D., additional, Johnson, E. N., additional, Zechmeister, M., additional, Montes, D., additional, López-Gallifa, Á., additional, Ribas, I., additional, Quirrenbach, A., additional, Amado, P. J., additional, Galadí-Enríquez, D., additional, Hatzes, A. P., additional, Kürster, M., additional, Danielski, C., additional, Béjar, V. J. S., additional, Kaminski, A., additional, Morales, J. C., additional, and Zapatero Osorio, M. R., additional

Published
2022
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12. The CARMENES search for exoplanets around M dwarfs

Author

P. Schöfer, S. V. Jeffers, A. Reiners, M. Zechmeister, B. Fuhrmeister, M. Lafarga, I. Ribas, A. Quirrenbach, P. J. Amado, J. A. Caballero, G. Anglada-Escudé, F. F. Bauer, V. J. S. Béjar, M. Cortés-Contreras, E. Díez Alonso, S. Dreizler, E. W. Guenther, O. Herbort, E. N. Johnson, A. Kaminski, M. Kürster, D. Montes, J. C. Morales, S. Pedraz, L. Tal-Or, Ministerio de Ciencia e Innovación (España), and European Commission

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), Astrofísica, Stars: activity, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Stars: rotation, FOS: Physical sciences, Stars: low-mass, Astronomy and Astrophysics, Stars: late-type, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics - Earth and Planetary Astrophysics
Abstract

This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe-to-Open model. Subscribe to A&A to support open access publication, Context. The Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Échelle Spectrographs (CARMENES) instrument is searching for periodic radial-velocity (RV) variations of M dwarfs, which are induced by orbiting planets. However, there are other potential sources of such variations, including rotational modulation caused by stellar activity. Aims. We aim to investigate four M dwarfs (Ross 318, YZ CMi, TYC 3529-1437-1, and EV Lac) with different activity levels and spectral sub-types. Our goal is to compare the periodicities seen in 22 activity indicators and the stellar RVs, and to examine their stability over time. Methods. For each star, we calculated generalised Lomb-Scargle periodograms of pseudo-equivalent widths of chromospheric lines, indices of photospheric bands, the differential line width as a measure of the width of the average photospheric absorption line, the RV, the chromatic index that describes the wavelength dependence of the RV, and parameters of the cross-correlation function. We also calculated periodograms for subsets of the data and compared our results to TESS photometry. Results. We find the rotation periods of all four stars to manifest themselves in the RV and photospheric indicators, particularly the TiO 7050 index, whereas the chromospheric lines show clear signals only at lower activity levels. For EV Lac and TYC 3529-1437-1, we find episodes during which indicators vary with the rotation period, and episodes during which they vary with half the rotation period, similarly to photometric light curves. Conclusions. The changing periodicities reflect the evolution of stellar activity features on the stellar surface. We therefore conclude that our results not only emphasise the importance of carefully analysing indicators complementary to the RV in RV surveys, but they also suggest that it is also useful to search for signals in activity indicators in subsets of the dataset, because an activity signal that is present in the RV may not be visible in the activity indicators all the time, in particular for the most active stars. © P. Schöfer et al. 2022., CARMENES is an instrument for the Centro Astronómico Hispano-Alemán de Calar Alto (CAHA, Almería, Spain). CARMENES is funded by the German Max-Planck-Gesellschaft (MPG), the Spanish Consejo Superior de Investigaciones Científicas (CSIC), the European Union through FEDER/ERF FICTS-2011-02 funds, and the members of the CARMENES Consortium (Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Andalucía, Landessternwarte Königstuhl, Institut de Ciències de l’Espai, Institut für Astrophysik Göttingen, Universidad Complutense de Madrid, Thüringer Landessternwarte Tautenburg, Instituto de Astrofísica de Canarias, Hamburger Sternwarte, Centro de Astrobiología and Centro Astronómico Hispano-Alemán), with additional contributions by the Spanish Ministry of Science, the German Science Foundation through the Major Research Instrumentation Programme and DFG Research Unit FOR2544 “Blue Planets around Red Stars”, the Klaus Tschira Stiftung, the states of Baden-Württemberg and Niedersachsen, and by the Junta de Andalucía. S.V.J. also acknowledges the support of the DFG priority program SPP 1992 “Exploring the Diversity of Extrasolar Planets (JE 701/5-1)”. L.T.-O. also acknowledges support from the Israel Science Foundation (grant no. 848/16). This paper includes data collected by the TESS mission, which are publicly available from the Mikulski Archive for Space Telescopes (MAST). Funding for the TESS mission is provided by NASA’s Science Mission directorate., With funding from the Spanish government through the Severo Ochoa Centre of Excellence accreditation SEV-2017-0709.

Published
2022
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13. Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270

Author

E. N. Johnson, S. Czesla, B. Fuhrmeister, P. Schöfer, Y. Shan, C. Cardona Guillén, A. Reiners, S. V. Jeffers, S. Lalitha, R. Luque, E. Rodríguez, V. J. S. Béjar, J. A. Caballero, L. Tal-Or, M. Zechmeister, I. Ribas, P. J. Amado, A. Quirrenbach, M. Cortés-Contreras, S. Dreizler, A. Fukui, M. J. López-González, A. P. Hatzes, Th. Henning, A. Kaminski, M. Kürster, M. Lafarga, D. Montes, J. C.

Published
2021
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14. Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270

Author

Johnson, E. N., primary, Czesla, S., additional, Fuhrmeister, B., additional, Schöfer, P., additional, Shan, Y., additional, Cardona Guillén, C., additional, Reiners, A., additional, Jeffers, S. V., additional, Lalitha, S., additional, Luque, R., additional, Rodríguez, E., additional, Béjar, V. J. S., additional, Caballero, J. A., additional, Tal-Or, L., additional, Zechmeister, M., additional, Ribas, I., additional, Amado, P. J., additional, Quirrenbach, A., additional, Cortés-Contreras, M., additional, Dreizler, S., additional, Fukui, A., additional, López-González, M. J., additional, Hatzes, A. P., additional, Henning, Th., additional, Kaminski, A., additional, Kürster, M., additional, Lafarga, M., additional, Montes, D., additional, Morales, J. C., additional, Murgas, F., additional, Narita, N., additional, Pallé, E., additional, Parviainen, H., additional, Pedraz, S., additional, Pollacco, D., additional, and Sota, A., additional

Published
2021
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15. The CARMENES search for exoplanets around M dwarfs

Author

Fuhrmeister, B., primary, Czesla, S., additional, Hildebrandt, L., additional, Nagel, E., additional, Schmitt, J. H. M. M., additional, Jeffers, S. V., additional, Caballero, J. A., additional, Hintz, D., additional, Johnson, E. N., additional, Schöfer, P., additional, Zechmeister, M., additional, Reiners, A., additional, Ribas, I., additional, Amado, P. J., additional, Quirrenbach, A., additional, Nortmann, L., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Cortés-Contreras, M., additional, Dreizler, S., additional, Galadí-Enríquez, D., additional, Hatzes, A. P., additional, Kaminski, A., additional, Kürster, M., additional, Lafarga, M., additional, and Montes, D., additional

Published
2020
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16. The CARMENES search for exoplanets around M dwarfs

Author

Hintz, D., primary, Fuhrmeister, B., additional, Czesla, S., additional, Schmitt, J. H. M. M., additional, Schweitzer, A., additional, Nagel, E., additional, Johnson, E. N., additional, Caballero, J. A., additional, Zechmeister, M., additional, Jeffers, S. V., additional, Reiners, A., additional, Ribas, I., additional, Amado, P. J., additional, Quirrenbach, A., additional, Anglada-Escudé, G., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Cortés-Contreras, M., additional, Dreizler, S., additional, Galadí-Enríquez, D., additional, Guenther, E. W., additional, Hauschildt, P. H., additional, Kaminski, A., additional, Kürster, M., additional, Lafarga, M., additional, López del Fresno, M., additional, Montes, D., additional, and Morales, J. C., additional

Published
2020
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17. The CARMENES search for exoplanets around M dwarfs

Author

Fuhrmeister, B., primary, Czesla, S., additional, Hildebrandt, L., additional, Nagel, E., additional, Schmitt, J. H. M. M., additional, Hintz, D., additional, Johnson, E. N., additional, Sanz-Forcada, J., additional, Schöfer, P., additional, Jeffers, S. V., additional, Caballero, J. A., additional, Zechmeister, M., additional, Reiners, A., additional, Ribas, I., additional, Amado, P. J., additional, Quirrenbach, A., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Cortés-Contreras, M., additional, Díez-Alonso, E., additional, Dreizler, S., additional, Galadí-Enríquez, D., additional, Guenther, E. W., additional, Kaminski, A., additional, Kürster, M., additional, Lafarga, M., additional, and Montes, D., additional

Published
2019
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18. The CARMENES search for exoplanets around M dwarfs

Author

Zechmeister, M., primary, Dreizler, S., additional, Ribas, I., additional, Reiners, A., additional, Caballero, J. A., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, González-Cuesta, L., additional, Herrero, E., additional, Lalitha, S., additional, López-González, M. J., additional, Luque, R., additional, Morales, J. C., additional, Pallé, E., additional, Rodríguez, E., additional, Rodríguez López, C., additional, Tal-Or, L., additional, Anglada-Escudé, G., additional, Quirrenbach, A., additional, Amado, P. J., additional, Abril, M., additional, Aceituno, F. J., additional, Aceituno, J., additional, Alonso-Floriano, F. J., additional, Ammler-von Eiff, M., additional, Antona Jiménez, R., additional, Anwand-Heerwart, H., additional, Arroyo-Torres, B., additional, Azzaro, M., additional, Baroch, D., additional, Barrado, D., additional, Becerril, S., additional, Benítez, D., additional, Berdiñas, Z. M., additional, Bergond, G., additional, Bluhm, P., additional, Brinkmöller, M., additional, del Burgo, C., additional, Calvo Ortega, R., additional, Cano, J., additional, Cardona Guillén, C., additional, Carro, J., additional, Cárdenas Vázquez, M. C., additional, Casal, E., additional, Casasayas-Barris, N., additional, Casanova, V., additional, Chaturvedi, P., additional, Cifuentes, C., additional, Claret, A., additional, Colomé, J., additional, Cortés-Contreras, M., additional, Czesla, S., additional, Díez-Alonso, E., additional, Dorda, R., additional, Fernández, M., additional, Fernández-Martín, A., additional, Fuhrmeister, B., additional, Fukui, A., additional, Galadí-Enríquez, D., additional, Gallardo Cava, I., additional, Garcia de la Fuente, J., additional, Garcia-Piquer, A., additional, García Vargas, M. L., additional, Gesa, L., additional, Góngora Rueda, J., additional, González-Álvarez, E., additional, González Hernández, J. I., additional, González-Peinado, R., additional, Grözinger, U., additional, Guàrdia, J., additional, Guijarro, A., additional, de Guindos, E., additional, Hatzes, A. P., additional, Hauschildt, P. H., additional, Hedrosa, R. P., additional, Helmling, J., additional, Henning, T., additional, Hermelo, I., additional, Hernández Arabi, R., additional, Hernández Castaño, L., additional, Hernández Otero, F., additional, Hintz, D., additional, Huke, P., additional, Huber, A., additional, Jeffers, S. V., additional, Johnson, E. N., additional, de Juan, E., additional, Kaminski, A., additional, Kemmer, J., additional, Kim, M., additional, Klahr, H., additional, Klein, R., additional, Klüter, J., additional, Klutsch, A., additional, Kossakowski, D., additional, Kürster, M., additional, Labarga, F., additional, Lafarga, M., additional, Llamas, M., additional, Lampón, M., additional, Lara, L. M., additional, Launhardt, R., additional, Lázaro, F. J., additional, Lodieu, N., additional, López del Fresno, M., additional, López-Puertas, M., additional, López Salas, J. F., additional, López-Santiago, J., additional, Magán Madinabeitia, H., additional, Mall, U., additional, Mancini, L., additional, Mandel, H., additional, Marfil, E., additional, Marín Molina, J. A., additional, Maroto Fernández, D., additional, Martín, E. L., additional, Martín-Fernández, P., additional, Martín-Ruiz, S., additional, Marvin, C. J., additional, Mirabet, E., additional, Montañés-Rodríguez, P., additional, Montes, D., additional, Moreno-Raya, M. E., additional, Nagel, E., additional, Naranjo, V., additional, Narita, N., additional, Nortmann, L., additional, Nowak, G., additional, Ofir, A., additional, Oshagh, M., additional, Panduro, J., additional, Parviainen, H., additional, Pascual, J., additional, Passegger, V. M., additional, Pavlov, A., additional, Pedraz, S., additional, Pérez-Calpena, A., additional, Pérez Medialdea, D., additional, Perger, M., additional, Perryman, M. A. C., additional, Rabaza, O., additional, Ramón Ballesta, A., additional, Rebolo, R., additional, Redondo, P., additional, Reffert, S., additional, Reinhardt, S., additional, Rhode, P., additional, Rix, H.-W., additional, Rodler, F., additional, Rodríguez Trinidad, A., additional, Rosich, A., additional, Sadegi, S., additional, Sánchez-Blanco, E., additional, Sánchez Carrasco, M. A., additional, Sánchez-López, A., additional, Sanz-Forcada, J., additional, Sarkis, P., additional, Sarmiento, L. F., additional, Schäfer, S., additional, Schmitt, J. H. M. M., additional, Schöfer, P., additional, Schweitzer, A., additional, Seifert, W., additional, Shulyak, D., additional, Solano, E., additional, Sota, A., additional, Stahl, O., additional, Stock, S., additional, Strachan, J. B. P., additional, Stuber, T., additional, Stürmer, J., additional, Suárez, J. C., additional, Tabernero, H. M., additional, Tala Pinto, M., additional, Trifonov, T., additional, Veredas, G., additional, Vico Linares, J. I., additional, Vilardell, F., additional, Wagner, K., additional, Wolthoff, V., additional, Xu, W., additional, Yan, F., additional, and Zapatero Osorio, M. R., additional

Published
2019
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19. The CARMENES search for exoplanets around M dwarfs

Author

Hintz, D., primary, Fuhrmeister, B., additional, Czesla, S., additional, Schmitt, J. H. M. M., additional, Johnson, E. N., additional, Schweitzer, A., additional, Caballero, J. A., additional, Zechmeister, M., additional, Jeffers, S. V., additional, Reiners, A., additional, Ribas, I., additional, Amado, P. J., additional, Quirrenbach, A., additional, Anglada-Escudé, G., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Cortés-Contreras, M., additional, Dreizler, S., additional, Galadí-Enríquez, D., additional, Guenther, E. W., additional, Hauschildt, P. H., additional, Kaminski, A., additional, Kürster, M., additional, Lafarga, M., additional, López del Fresno, M., additional, Montes, D., additional, Morales, J. C., additional, Passegger, V. M., additional, and Seifert, W., additional

Published
2019
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20. The CARMENES search for exoplanets around M dwarfs

Author

Schöfer, P., primary, Jeffers, S. V., additional, Reiners, A., additional, Shulyak, D., additional, Fuhrmeister, B., additional, Johnson, E. N., additional, Zechmeister, M., additional, Ribas, I., additional, Quirrenbach, A., additional, Amado, P. J., additional, Caballero, J. A., additional, Anglada-Escudé, G., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Cortés-Contreras, M., additional, Dreizler, S., additional, Guenther, E. W., additional, Kaminski, A., additional, Kürster, M., additional, Lafarga, M., additional, Montes, D., additional, Morales, J. C., additional, Pedraz, S., additional, and Tal-Or, L., additional

Published
2019
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21. The CARMENES search for exoplanets around M dwarfs

Author

Fuhrmeister, B., primary, Czesla, S., additional, Schmitt, J. H. M. M., additional, Jeffers, S. V., additional, Caballero, J. A., additional, Zechmeister, M., additional, Reiners, A., additional, Ribas, I., additional, Amado, P. J., additional, Quirrenbach, A., additional, Béjar, V. J. S., additional, Galadí-Enríquez, D., additional, Guenther, E. W., additional, Kürster, M., additional, Montes, D., additional, and Seifert, W., additional

Published
2018
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22. The CARMENES search for exoplanets around M dwarfs

Author

Tal-Or, L., primary, Zechmeister, M., additional, Reiners, A., additional, Jeffers, S. V., additional, Schöfer, P., additional, Quirrenbach, A., additional, Amado, P. J., additional, Ribas, I., additional, Caballero, J. A., additional, Aceituno, J., additional, Bauer, F. F., additional, Béjar, V. J. S., additional, Czesla, S., additional, Dreizler, S., additional, Fuhrmeister, B., additional, Hatzes, A. P., additional, Johnson, E. N., additional, Kürster, M., additional, Lafarga, M., additional, Montes, D., additional, Morales, J. C., additional, Reffert, S., additional, Sadegi, S., additional, Seifert, W, additional, and Shulyak, D., additional

Published
2018
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23. The CARMENES search for exoplanets around M dwarfs

Author

Reiners, A., primary, Zechmeister, M., additional, Caballero, J. A., additional, Ribas, I., additional, Morales, J. C., additional, Jeffers, S. V., additional, Schöfer, P., additional, Tal-Or, L., additional, Quirrenbach, A., additional, Amado, P. J., additional, Kaminski, A., additional, Seifert, W., additional, Abril, M., additional, Aceituno, J., additional, Alonso-Floriano, F. J., additional, Ammler-von Eiff, M., additional, Antona, R., additional, Anglada-Escudé, G., additional, Anwand-Heerwart, H., additional, Arroyo-Torres, B., additional, Azzaro, M., additional, Baroch, D., additional, Barrado, D., additional, Bauer, F. F., additional, Becerril, S., additional, Béjar, V. J. S., additional, Benítez, D., additional, Berdinas̃, Z. M., additional, Bergond, G., additional, Blümcke, M., additional, Brinkmöller, M., additional, del Burgo, C., additional, Cano, J., additional, Cárdenas Vázquez, M. C., additional, Casal, E., additional, Cifuentes, C., additional, Claret, A., additional, Colomé, J., additional, Cortés-Contreras, M., additional, Czesla, S., additional, Díez-Alonso, E., additional, Dreizler, S., additional, Feiz, C., additional, Fernández, M., additional, Ferro, I. M., additional, Fuhrmeister, B., additional, Galadí-Enríquez, D., additional, Garcia-Piquer, A., additional, García Vargas, M. L., additional, Gesa, L., additional, Gómez Galera, V., additional, González Hernández, J. I., additional, González-Peinado, R., additional, Grözinger, U., additional, Grohnert, S., additional, Guàrdia, J., additional, Guenther, E. W., additional, Guijarro, A., additional, de Guindos, E., additional, Gutiérrez-Soto, J., additional, Hagen, H.-J., additional, Hatzes, A. P., additional, Hauschildt, P. H., additional, Hedrosa, R. P., additional, Helmling, J., additional, Henning, Th., additional, Hermelo, I., additional, Hernández Arabí, R., additional, Hernández Castaño, L., additional, Hernández Hernando, F., additional, Herrero, E., additional, Huber, A., additional, Huke, P., additional, Johnson, E. N., additional, de Juan, E., additional, Kim, M., additional, Klein, R., additional, Klüter, J., additional, Klutsch, A., additional, Kürster, M., additional, Lafarga, M., additional, Lamert, A., additional, Lampón, M., additional, Lara, L. M., additional, Laun, W., additional, Lemke, U., additional, Lenzen, R., additional, Launhardt, R., additional, López del Fresno, M., additional, López-González, J., additional, López-Puertas, M., additional, López Salas, J. F., additional, López-Santiago, J., additional, Luque, R., additional, Magán Madinabeitia, H., additional, Mall, U., additional, Mancini, L., additional, Mandel, H., additional, Marfil, E., additional, Marín Molina, J. A., additional, Maroto Fernández, D., additional, Martín, E. L., additional, Martín-Ruiz, S., additional, Marvin, C. J., additional, Mathar, R. J., additional, Mirabet, E., additional, Montes, D., additional, Moreno-Raya, M. E., additional, Moya, A., additional, Mundt, R., additional, Nagel, E., additional, Naranjo, V., additional, Nortmann, L., additional, Nowak, G., additional, Ofir, A., additional, Oreiro, R., additional, Pallé, E., additional, Panduro, J., additional, Pascual, J., additional, Passegger, V. M., additional, Pavlov, A., additional, Pedraz, S., additional, Pérez-Calpena, A., additional, Pérez Medialdea, D., additional, Perger, M., additional, Perryman, M. A. C., additional, Pluto, M., additional, Rabaza, O., additional, Ramón, A., additional, Rebolo, R., additional, Redondo, P., additional, Reffert, S., additional, Reinhart, S., additional, Rhode, P., additional, Rix, H.-W., additional, Rodler, F., additional, Rodríguez, E., additional, Rodríguez-López, C., additional, Rodríguez Trinidad, A., additional, Rohloff, R.-R., additional, Rosich, A., additional, Sadegi, S., additional, Sánchez-Blanco, E., additional, Sánchez Carrasco, M. A., additional, Sánchez-López, A., additional, Sanz-Forcada, J., additional, Sarkis, P., additional, Sarmiento, L. F., additional, Schäfer, S., additional, Schmitt, J. H. M. M., additional, Schiller, J., additional, Schweitzer, A., additional, Solano, E., additional, Stahl, O., additional, Strachan, J. B. P., additional, Stürmer, J., additional, Suárez, J. C., additional, Tabernero, H. M., additional, Tala, M., additional, Trifonov, T., additional, Tulloch, S. M., additional, Ulbrich, R. G., additional, Veredas, G., additional, Vico Linares, J. I., additional, Vilardell, F., additional, Wagner, K., additional, Winkler, J., additional, Wolthoff, V., additional, Xu, W., additional, Yan, F., additional, and Zapatero Osorio, M. R., additional

Published
2018
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24. The CARMENES search for exoplanets around M dwarfs

Author

Birgit Fuhrmeister, F. F. Bauer, Artie P. Hatzes, M. Lafarga, J. Aceituno, Ignasi Ribas, Andreas Quirrenbach, Jose A. Caballero, D. Montes, Pedro J. Amado, Martin Kürster, Mathias Zechmeister, Juan Carlos Morales, Walter Seifert, Lev Tal-Or, S. Sadegi, S. Czesla, S. Dreizler, E. N. Johnson, Víctor J. S. Béjar, Ansgar Reiners, P. Schöfer, Denis Shulyak, S. V. Jeffers, Sabine Reffert, Max Planck Society, Consejo Superior de Investigaciones Científicas (España), European Commission, Ministerio de Economía y Competitividad (España), Ministry of Science, Research and Art Baden-Württemberg, German Research Foundation, Junta de Andalucía, and Universidad Complutense de Madrid

Subjects
Stars: activity, Astrofísica, FOS: Physical sciences, Context (language use), Stars: late-type, Astrophysics, 01 natural sciences, Spectral line, Planet, 0103 physical sciences, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Earth and Planetary Astrophysics (astro-ph.EP), Physics, radial velocities [Techniques], 010308 nuclear & particles physics, Stars: rotation, Astronomy and Astrophysics, Exoplanet, rotation [Stars], Astronomía, Radial velocity, Stars, Amplitude, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Techniques: radial velocities, late-type [Stars], H-alpha, activity [Stars], Astrophysics - Earth and Planetary Astrophysics
Abstract

Previous simulations predicted the activity-induced radial-velocity (RV) variations of M dwarfs to range from $\sim1$ cm/s to $\sim1$ km/s, depending on various stellar and activity parameters. We investigate the observed relations between RVs, stellar activity, and stellar parameters of M dwarfs by analyzing CARMENES high-resolution visual-channel spectra ($0.5$$-$$1$$��$m), which were taken within the CARMENES RV planet survey during its first $20$ months of operation. During this time, $287$ of the CARMENES-sample stars were observed at least five times. From each spectrum we derived a relative RV and a measure of chromospheric H$��$ emission. In addition, we estimated the chromatic index (CRX) of each spectrum, which is a measure of the RV wavelength dependence. Despite having a median number of only $11$ measurements per star, we show that the RV variations of the stars with RV scatter of $>10$ m/s and a projected rotation velocity $v \sin{i}>2$ km/s are caused mainly by activity. We name these stars `active RV-loud stars' and find their occurrence to increase with spectral type: from $\sim3\%$ for early-type M dwarfs (M$0.0$$-$$2.5$V) through $\sim30\%$ for mid-type M dwarfs (M$3.0$$-$$5.5$V) to $>50\%$ for late-type M dwarfs (M$6.0$$-$$9.0$V). Their RV-scatter amplitude is found to be correlated mainly with $v \sin{i}$. For about half of the stars, we also find a linear RV$-$CRX anticorrelation, which indicates that their activity-induced RV scatter is lower at longer wavelengths. For most of them we can exclude a linear correlation between RV and H$��$ emission. Our results are in agreement with simulated activity-induced RV variations in M dwarfs. The RV variations of most active RV-loud M dwarfs are likely to be caused by dark spots on their surfaces, which move in and out of view as the stars rotate., A&A accepted

Published
2018
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25. The CARMENES search for exoplanets around M dwarfs

Author

Trifonov, T., primary, Kürster, M., additional, Zechmeister, M., additional, Tal-Or, L., additional, Caballero, J. A., additional, Quirrenbach, A., additional, Amado, P. J., additional, Ribas, I., additional, Reiners, A., additional, Reffert, S., additional, Dreizler, S., additional, Hatzes, A. P., additional, Kaminski, A., additional, Launhardt, R., additional, Henning, Th., additional, Montes, D., additional, Béjar, V. J. S., additional, Mundt, R., additional, Pavlov, A., additional, Schmitt, J. H. M. M., additional, Seifert, W., additional, Morales, J. C., additional, Nowak, G., additional, Jeffers, S. V., additional, Rodríguez-López, C., additional, del Burgo, C., additional, Anglada-Escudé, G., additional, López-Santiago, J., additional, Mathar, R. J., additional, Ammler-von Eiff, M., additional, Guenther, E. W., additional, Barrado, D., additional, González Hernández, J. I., additional, Mancini, L., additional, Stürmer, J., additional, Abril, M., additional, Aceituno, J., additional, Alonso-Floriano, F. J., additional, Antona, R., additional, Anwand-Heerwart, H., additional, Arroyo-Torres, B., additional, Azzaro, M., additional, Baroch, D., additional, Bauer, F. F., additional, Becerril, S., additional, Benítez, D., additional, Berdiñas, Z. M., additional, Bergond, G., additional, Blümcke, M., additional, Brinkmöller, M., additional, Cano, J., additional, Cárdenas Vázquez, M. C., additional, Casal, E., additional, Cifuentes, C., additional, Claret, A., additional, Colomé, J., additional, Cortés-Contreras, M., additional, Czesla, S., additional, Díez-Alonso, E., additional, Feiz, C., additional, Fernández, M., additional, Ferro, I. M., additional, Fuhrmeister, B., additional, Galadí-Enríquez, D., additional, Garcia-Piquer, A., additional, García Vargas, M. L., additional, Gesa, L., additional, Gómez Galera, V., additional, González-Peinado, R., additional, Grözinger, U., additional, Grohnert, S., additional, Guàrdia, J., additional, Guijarro, A., additional, de Guindos, E., additional, Gutiérrez-Soto, J., additional, Hagen, H.-J., additional, Hauschildt, P. H., additional, Hedrosa, R. P., additional, Helmling, J., additional, Hermelo, I., additional, Hernández Arabí, R., additional, Hernández Castaño, L., additional, Hernández Hernando, F., additional, Herrero, E., additional, Huber, A., additional, Huke, P., additional, Johnson, E., additional, de Juan, E., additional, Kim, M., additional, Klein, R., additional, Klüter, J., additional, Klutsch, A., additional, Lafarga, M., additional, Lampón, M., additional, Lara, L. M., additional, Laun, W., additional, Lemke, U., additional, Lenzen, R., additional, López del Fresno, M., additional, López-González, M. J., additional, López-Puertas, M., additional, López Salas, J. F., additional, Luque, R., additional, Magán Madinabeitia, H., additional, Mall, U., additional, Mandel, H., additional, Marfil, E., additional, Marín Molina, J. A., additional, Maroto Fernández, D., additional, Martín, E. L., additional, Martín-Ruiz, S., additional, Marvin, C. J., additional, Mirabet, E., additional, Moya, A., additional, Moreno-Raya, M. E., additional, Nagel, E., additional, Naranjo, V., additional, Nortmann, L., additional, Ofir, A., additional, Oreiro, R., additional, Pallé, E., additional, Panduro, J., additional, Pascual, J., additional, Passegger, V. M., additional, Pedraz, S., additional, Pérez-Calpena, A., additional, Pérez Medialdea, D., additional, Perger, M., additional, Perryman, M. A. C., additional, Pluto, M., additional, Rabaza, O., additional, Ramón, A., additional, Rebolo, R., additional, Redondo, P., additional, Reinhardt, S., additional, Rhode, P., additional, Rix, H.-W., additional, Rodler, F., additional, Rodríguez, E., additional, Rodríguez Trinidad, A., additional, Rohloff, R.-R., additional, Rosich, A., additional, Sadegi, S., additional, Sánchez-Blanco, E., additional, Sánchez Carrasco, M. A., additional, Sánchez-López, A., additional, Sanz-Forcada, J., additional, Sarkis, P., additional, Sarmiento, L. F., additional, Schäfer, S., additional, Schiller, J., additional, Schöfer, P., additional, Schweitzer, A., additional, Solano, E., additional, Stahl, O., additional, Strachan, J. B. P., additional, Suárez, J. C., additional, Tabernero, H. M., additional, Tala, M., additional, Tulloch, S. M., additional, Veredas, G., additional, Vico Linares, J. I., additional, Vilardell, F., additional, Wagner, K., additional, Winkler, J., additional, Wolthoff, V., additional, Xu, W., additional, Yan, F., additional, and Zapatero Osorio, M. R., additional

Published
2018
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26. Multiwavelength observations of a giant flare on CN Leonis

Author

Ansgar Reiners, C. Liefke, Jürgen H. M. M. Schmitt, and Birgit Fuhrmeister

Subjects
010504 meteorology & atmospheric sciences, Electromagnetic spectrum, Astrophysics::High Energy Astrophysical Phenomena, activity, flare, chromospheres, stars, late-type, individual, CN Leo, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, medicine.disease_cause, 01 natural sciences, law.invention, law, 0103 physical sciences, medicine, Astrophysics::Solar and Stellar Astrophysics, Emission spectrum, 010303 astronomy & astrophysics, Chromosphere, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Physics, Astrophysics (astro-ph), Astronomy and Astrophysics, Plasma, Stars, Space and Planetary Science, Physics::Space Physics, Spectral atlas, Ultraviolet, Flare
Abstract

Flares on dM stars contain plasmas at very different temperatures and thus affect a wide wavelength range in the electromagnetic spectrum. While the coronal properties of flares are studied best in X-rays, the chromosphere of the star is observed best in the optical and ultraviolet ranges. Therefore, multiwavelength observations are essential to study flare properties throughout the atmosphere of a star. We analysed simultaneous observations with UVES/VLT and XMM-Newton of the active M5.5 dwarf CN Leo (Gl 406) exhibiting a major flare. The optical data cover the wavelength range from 3000 to 10000 Angstrom. From our optical data, we find an enormous wealth of chromospheric emission lines occurring throughout the spectrum. We identify a total of 1143 emission lines, out of which 154 are located in the red arm, increasing the number of observed emission lines in this red wavelength range by about a factor of 10. Here we present an emission line list and a spectral atlas. We also find line asymmetries for H I, He I, and Ca II lines. For the last, this is the first observation of asymmetries due to a stellar flare. During the flare onset, there is additional flux found in the blue wing, while in the decay phase, additional flux is found in the red wing. We interpret both features as caused by mass motions. In addition to the lines, the flare manifests itself in the enhancement of the continuum throughout the whole spectrum, inverting the normal slope for the net flare spectrum., Comment: 15 pages, accepted by A&A

Published
2008
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29. Simultaneous XMM-Newton and VLT/UVES observations of the flare star CN Leonis

Author

Birgit Fuhrmeister, J. H. M. M. Schmitt, and C. Liefke

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, Flare star, Flux, Astronomy, Astronomy and Astrophysics, Astrophysics, Ion, Cover (topology), Space and Planetary Science, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics, Light emission, Emission spectrum, X ray spectra, Astrophysics::Galaxy Astrophysics, Line (formation)
Abstract

Aims. We present simultaneous observations with VLT/UVES and XMM-Newton of the active M5.5 dwarf CN Leo (Gl 406). The data were gathered during three half nights in May 2004 and December 2005, and they cover quiescent states, as well as flaring activity. Our main aim is to derive coronal properties from X-ray data and to compare these to results from the optical $\ion{Fe}{xiii}$ line. Methods. We studied simultaneously-measured coronal and chromospheric parameters of CN Leo as determined from the XMM-Newton X-ray data, the forbidden optical coronal $\ion{Fe}{xiii}$ line at 3388 A, and various optical chromospheric emission lines. Results. We find that different activity levels of CN Leo can be traced as well in X-rays as with the $\ion{Fe}{xiii}$ line. Moreover, the $\ion{Fe}{xiii}$ line flux is in good agreement with a prediction using the differential emission measure as determined from the X-ray spectrum and Fe atomic data. We also present coronal X-ray properties for the quiescent and flaring states of CN Leo. During a flare two $\ion{He}{ii}$ transition region lines are also detected in the optical data.

Published
2007
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30. Influence of NLTE calculations on the hydrogen lines in chromospheric models

Author

Peter H. Hauschildt, C. I. Short, and Birgit Fuhrmeister

Subjects
Physics, Iron group, Static model, Hydrogen, chemistry, Space and Planetary Science, Solar spectra, Model spectrum, chemistry.chemical_element, Astronomy and Astrophysics, Astrophysics, Chromosphere
Abstract

We present extensive NLTE calculations for a semi-empirical solar 1D chromosphere model based on the VAL C model. We report on a significant influence of nitrogen, oxygen, and sulfur on the emergent hydrogen emission with respect to LTE vs. NLTE calculations for these elements. Moreover, we present a model spectrum with 20 light and iron group elements computed in NLTE. We compare this to an observed solar spectrum and to a photospheric model spectrum. We find that the agreement for this model with the data is less good than the original VAL C model especially in the UV. This may imply the need of changes in the chromospheric temperature structure or may point to general problems of static 1D chromospheric models.

Published
2006
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31. Detection of red line asymmetries in LHS 2034

Author

Birgit Fuhrmeister, Peter H. Hauschildt, and J. H. M. M. Schmitt

Subjects
Physics, media_common.quotation_subject, Astronomy, Balmer series, Astronomy and Astrophysics, Astrophysics, Asymmetry, law.invention, symbols.namesake, Amplitude, Space and Planetary Science, law, symbols, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Chromosphere, Short duration, Flare, media_common, Line (formation)
Abstract

We report very pronounced line asymmetries during a long duration flare on the dM6 star LHS 2034 (AZ Cnc). While all lines of the Balmer series and all strong He  lines show these asymmetries, the metal lines do not. This can be explained with the help of PHOENIX model chromospheres considering the formation depth of the lines involved. Moreover, the asymmetries persist over about one hour changing shape and amplitude. Fitting the asymmetries with an additional broad Gaussian component leads us to the scenario of a series of downward propagating condensations that decelerate due to the higher density of the lower chromosphere. In addition, similar but weaker line asymmetries were found in LHS 2397a.

Published
2005
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32. Fe XIII coronal line emission in cool M dwarfs

Author

R. Wichmann, Birgit Fuhrmeister, and J. H. M. M. Schmitt

Subjects
Physics, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Stellar classification, law.invention, Stars, Space and Planetary Science, law, Coronal plane, Flare, Line (formation)
Abstract

We report on a search for the Fe xiii forbidden coronal line at 3388.1 \AA in a sample of 15 M-type dwarf stars covering the whole spectral class as well as different levels of activity. A clear detection was achieved for LHS 2076 during a major flare and for CN Leo, where the line had been discovered before. For some other stars the situation is not quite clear. For CN Leo we investigated the timing behaviour of the Fe xiii line and report a high level of variability on a timescale of hours which we ascribe to microflare heating., Comment: 13 pages, 10 figures

Published
2004
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33. Stellar rotation periods determined from simultaneously measured Ca II H&K and Ca II IRT lines

Author

Jürgen H. M. M. Schmitt, Klaus-Peter Schröder, M. Mittag, Birgit Fuhrmeister, A. Hempelmann, and J. N. González-Pérez

Subjects
Physics, 010308 nuclear & particles physics, Stellar rotation, Sampling (statistics), Astronomy and Astrophysics, Astrophysics, 01 natural sciences, Stars, Data sampling, Space and Planetary Science, 0103 physical sciences, Good evidence, Differential rotation, 010303 astronomy & astrophysics
Abstract

Aims. Previous studies have shown that, for late-type stars, activity indicators derived from the Ca ii infrared-triplet (IRT) lines are correlated with the indicators derived from the Ca ii HK we find good agreement for stars with already existing literature values. In a few cases the computed periodograms show a complicated structure with multiple peaks, meaning that formally different periods are derived in different indices. We show that in one case, this is due to data sampling effects and argue that denser cadence sampling is necessary to provide credible evidence for differential rotation. However, our TIGRE data for HD 101501 shows good evidence for the presence of differential rotation.

Published
2017
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34. Masses and activity of AB Doradus B a/b

Author

Wolter, U., primary, Czesla, S., additional, Fuhrmeister, B., additional, Robrade, J., additional, Engels, D., additional, Wieringa, M., additional, and Schmitt, J. H. M. M., additional

Published
2014
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36. Masses and activity of AB Doradus B a/b

Author

M. H. Wieringa, J. H. M. M. Schmitt, D. Engels, Jan Robrade, S. Czesla, Birgit Fuhrmeister, and U. Wolter

Subjects
Physics, Astronomy, Astronomy and Astrophysics, Astrophysics, Effective temperature, Orbital period, Spectral line, Optical spectra, Orbital inclination, law.invention, Photometry (optics), Space and Planetary Science, law, Spectroscopy, Flare
Abstract

Wepresent a multiwavelength study of the close binary AB Dor Ba/b (Rst137B). Our study comprises astrometric orbit measurements, optical spectroscopy, X-ray and radio observations. Using all available adaptive optics images of AB Dor B taken with VLT/NACO from 2004 to 2009, we tightly constrain its orbital period to 360.6 ± 1.5 days. We present the first orbital solution of Rst 137B and estimate the combined mass of AB Dor Ba+ ba s 0.69 +0.02 −0.24 M� , slightly exceeding previous estimates based on IR photometry. Our determined orbital inclination of Rst 137B is close to the axial inclination of AB Dor A inferred from Doppler imaging. Our VLT/UVES spectra yield high rotational velocities of ≥30 kms −1 for both components Ba and Bb, in accord with previous measurements, which corresponds to rotation periods significantly shorter than one day. Our combined spectral model, using PHOENIX spectra, yields an effective temperature of 3310 ± 50 K for the primary and approximately 60 K less for the secondary. The optical spectra presumably cover a chromospheric flare and show that at least one component of Rst 137B is significantly active. Activity and weak variations are also found in our simultaneous XMM-Newton observations, while our ATCA radio data yield constant fluxes at the level of previous measurements. Using evolutionary models, our newly determined stellar parameters confirm that the age of Rst 137B is between 50 and 100 Myr.

Published
2014
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37. Keplersuper-flare stars: what are they?

Author

Evangelos Nagel, Birgit Fuhrmeister, R. Wichmann, and U. Wolter

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Kepler, law.invention, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, law, White light, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics, Flare
Abstract

The Kepler mission has led to the serendipitous discovery of a significant number of `super flares' - white light flares with energies between 10^33 erg and 10^36 erg - on solar-type stars. It has been speculated that these could be `freak' events that might happen on the Sun, too. We have started a programme to study the nature of the stars on which these super flares have been observed. Here we present high-resolution spectroscopy of 11 of these stars and discuss our results. We find that several of these stars are very young, fast-rotating stars where high levels of stellar activity can be expected, but for some other stars we do not find a straightforward explanation for the occurrence of super flares., Accepted for publication in A&A, 9 pages, 4 figures

Published
2014
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40. The stellar content of the Hamburg/ESO survey

Author

Schörck, T., primary, Christlieb, N., additional, Cohen, J. G., additional, Beers, T. C., additional, Shectman, S., additional, Thompson, I., additional, McWilliam, A., additional, Bessell, M. S., additional, Norris, J. E., additional, Meléndez, J., additional, Ramírez, S., additional, Haynes, D., additional, Cass, P., additional, Hartley, M., additional, Russell, K., additional, Watson, F., additional, Zickgraf, F.-J., additional, Behnke, B., additional, Fechner, C., additional, Fuhrmeister, B., additional, Barklem, P. S., additional, Edvardsson, B., additional, Frebel, A., additional, Wisotzki, L., additional, and Reimers, D., additional

Published
2009
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49. Two temperate Earth-mass planet candidates around Teegarden’s Star

Author

Zechmeister, M., Dreizler, S., Ribas, I., Reiners, A., Caballero, J. A., Bauer, F. F., Béjar, V. J. S., González-Cuesta, L., Herrero, E., Lalitha, S., López-González, M. J., Luque, R., Morales, J. C., Pallé, E., Rodríguez, E., Rodríguez López, C., Tal-Or, L., Anglada-Escudé, G., Quirrenbach, A., Amado, P. J., Abril, M., Aceituno, F. J., Aceituno, J., Alonso-Floriano, F. J., Ammler-von Eiff, M., Antona Jiménez, R., Anwand-Heerwart, H., Arroyo-Torres, B., Azzaro, M., Baroch, D., Barrado, D., Becerril, S., Benítez, D., Berdiñas, Z. M., Bergond, G., Bluhm, P., Brinkmöller, M., del Burgo, C., Calvo Ortega, R., Cano, J., Cardona Guillén, C., Carro, J., Cárdenas Vázquez, M. C., Casal, E., Casasayas-Barris, N., Casanova, V., Chaturvedi, P., Cifuentes, C., Claret, A., Colomé, J., Cortés-Contreras, M., Czesla, S., Díez-Alonso, E., Dorda, R., Fernández, M., Fernández-Martín, A., Fuhrmeister, B., Fukui, A., Galadí-Enríquez, D., Gallardo Cava, I., Garcia de la Fuente, J., Garcia-Piquer, A., García Vargas, M. L., Gesa, L., Góngora Rueda, J., González-Álvarez, E., González Hernández, J. I., González-Peinado, R., Grözinger, U., Guàrdia, J., Guijarro, A., de Guindos, E., Hatzes, A. P., Hauschildt, P. H., Hedrosa, R. P., Helmling, J., Henning, T., Hermelo, I., Hernández Arabi, R., Hernández Castaño, L., Hernández Otero, F., Hintz, D., Huke, P., Huber, A., Jeffers, S. V., Johnson, E. N., de Juan, E., Kaminski, A., Kemmer, J., Kim, M., Klahr, H., Klein, R., Klüter, J., Klutsch, A., Kossakowski, D., Kürster, M., Labarga, F., Lafarga, M., Llamas, M., Lampón, M., Lara, L. M., Launhardt, R., Lázaro, F. J., Lodieu, N., López del Fresno, M., López-Puertas, M., López Salas, J. F., López-Santiago, J., Magán Madinabeitia, H., Mall, U., Mancini, L., Mandel, H., Marfil, E., Marín Molina, J. A., Maroto Fernández, D., Martín, E. L., Martín-Fernández, P., Martín-Ruiz, S., Marvin, C. J., Mirabet, E., Montañés-Rodríguez, P., Montes, D., Moreno-Raya, M. E., Nagel, E., Naranjo, V., Narita, N., Nortmann, L., Nowak, G., Ofir, A., Oshagh, M., Panduro, J., Parviainen, H., Pascual, J., Passegger, V. M., Pavlov, A., Pedraz, S., Pérez-Calpena, A., Pérez Medialdea, D., Perger, M., Perryman, M. A. C., Rabaza, O., Ramón Ballesta, A., Rebolo, R., Redondo, P., Reffert, S., Reinhardt, S., Rhode, P., Rix, H.-W., Rodler, F., Rodríguez Trinidad, A., Rosich, A., Sadegi, S., Sánchez-Blanco, E., Sánchez Carrasco, M. A., Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Sarmiento, L. F., Schäfer, S., Schmitt, J. H. M. M., Schöfer, P., Schweitzer, A., Seifert, W., Shulyak, D., Solano, E., Sota, A., Stahl, O., Stock, S., Strachan, J. B. P., Stuber, T., Stürmer, J., Suárez, J. C., Tabernero, H. M., Tala Pinto, M., Trifonov, T., Veredas, G., Vico Linares, J. I., Vilardell, F., Wagner, K., Wolthoff, V., Xu, W., Yan, F., and Zapatero Osorio, M. R.

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