Search

Your search keyword '"Konstantinova-Antova, R."' showing total 24 results
Start Over Author "Konstantinova-Antova, R." Publisher edp sciences
24 results on '"Konstantinova-Antova, R."'

1. A long-term study of the magnetic field and activity in the M giant RZ Ari

Author

Konstantinova-Antova, R., primary, Georgiev, S., additional, Lèbre, A., additional, Palacios, A., additional, Morin, J., additional, Bogdanovski, R., additional, Abbott, C., additional, Baron, F., additional, Aurière, M., additional, Drake, N. A., additional, Tsvetkova, S., additional, Josselin, E., additional, Paladini, C., additional, Mathias, P., additional, and Zamanov, R., additional

Published
2024
Full Text
View/download PDF

4. Evolution of the magnetic field of Betelgeuse from 2009–2017

Author

Mathias, P., primary, Aurière, M., additional, López Ariste, A., additional, Petit, P., additional, Tessore, B., additional, Josselin, E., additional, Lèbre, A., additional, Morin, J., additional, Wade, G., additional, Herpin, F., additional, Chiavassa, A., additional, Montargès, M., additional, Konstantinova-Antova, R., additional, Kervella, P., additional, Perrin, G., additional, Donati, J.-F., additional, and Grunhut, J., additional

Published
2018
Full Text
View/download PDF

7. Discovery of a complex linearly polarized spectrum of Betelgeuse dominated by depolarization of the continuum

Author

Aurière, M., primary, López Ariste, A., additional, Mathias, P., additional, Lèbre, A., additional, Josselin, E., additional, Montargès, M., additional, Petit, P., additional, Chiavassa, A., additional, Paletou, F., additional, Fabas, N., additional, Konstantinova-Antova, R., additional, Donati, J.-F., additional, Grunhut, J. H., additional, Wade, G. A., additional, Herpin, F., additional, Kervella, P., additional, Perrin, G., additional, and Tessore, B., additional

Published
2016
Full Text
View/download PDF

9. The magnetic fields at the surface of active single G-K giants

Author

Aurière, M., primary, Konstantinova-Antova, R., additional, Charbonnel, C., additional, Wade, G. A., additional, Tsvetkova, S., additional, Petit, P., additional, Dintrans, B., additional, Drake, N. A., additional, Decressin, T., additional, Lagarde, N., additional, Donati, J.-F., additional, Roudier, T., additional, Lignières, F., additional, Schröder, K.-P., additional, Landstreet, J. D., additional, Lèbre, A., additional, Weiss, W. W., additional, and Zahn, J.-P., additional

Published
2015
Full Text
View/download PDF

19. Lithium and magnetic fields in giant stars

Author

Lèbre, A., primary, Palacios, A., additional, do Nascimento, J. D., additional, Konstantinova-Antova, R., additional, Kolev, D., additional, Aurière, M., additional, de Laverny, P., additional, and De Medeiros, J. R., additional

Published
2009
Full Text
View/download PDF

20. Discovery of a weak magnetic field in the photosphere of the single giant Pollux

Author

Aurière, M., primary, Wade, G. A., additional, Konstantinova-Antova, R., additional, Charbonnel, C., additional, Catala, C., additional, Weiss, W. W., additional, Roudier, T., additional, Petit, P., additional, Donati, J.-F., additional, Alecian, E., additional, Cabanac, R., additional, Van Eck, S., additional, Folsom, C. P., additional, and Power, J., additional

Published
2009
Full Text
View/download PDF

23. Fast colorimetry of the flare star EV Lacertae fromUBVRIobservations in 2004

Author

Zhilyaev, B. E., primary, Romanyuk, Ya. O., additional, Svyatogorov, O. A., additional, Verlyuk, I. A., additional, Kaminsky, B., additional, Andreev, M., additional, Sergeev, A. V., additional, Gershberg, R. E., additional, Lovkaya, M. N., additional, Avgoloupis, S. J., additional, Seiradakis, J. H., additional, Contadakis, M. E., additional, Antov, A. P., additional, Konstantinova-Antova, R. K., additional, and Bogdanovski, R., additional

Published
2007
Full Text
View/download PDF

24. Magnetic field structure in single late-type giants: β Ceti in 2010-2012.

Author

Tsvetkova, S., Petit, P., Aurière, M., Konstantinova-Antova, R., Wade, G. A., Charbonnel, C., Decressin, T., and Bogdanovski, R.

Subjects
MAGNETIC fields, ASTROPHYSICAL spectropolarimetry, SIGNAL-to-noise ratio
Abstract

Aims. We study the behavior of the magnetic field and the line activity indicators of the single late-type giant β Ceti. Using spectropolarimetric data, we aim to reconstruct the magnetic field structure on the star's surface and to present the first magnetic maps for β Ceti. Methods. The data were obtained using two spectropolarimeters – Narval at the Bernard Lyot Télescope, Pic du Midi, France, and ESPaDOnS at CFHT, Hawaii. Thirty-eight circularly-polarized spectra have been collected in the period June 2010–January 2012. The least square deconvolution method was applied for extracting high signal-to-noise ratio line profiles, from which we measured the surface-averaged longitudinal magnetic field Bl. Chromospheric activity indicators CaII K, Hα, CaII IR (854.2 nm), and radial velocity were simultaneously measured, and their variability was analyzed along with the behavior of Bl. The Zeeman Doppler imaging (ZDI) inversion technique was employed for reconstructing the large-scale magnetic field and two magnetic maps of β Ceti are presented for two periods (June 2010–December 2010 and June 2011–January 2012). Results. The Bl stays with a same positive polarity for the whole observational period and shows significant variations in the interval 0.1–8.2 G. The behavior of the line activity indicators is in good agreement with the Bl variations. Searching for periodic signals in the Stokes V time series, we found a possible rotation period of 215 days. The two ZDI maps show a mainly axisymmetric and poloidal magnetic topology and a simple surface magnetic field configuration dominated by a dipole. Little evolution is observed between the two maps, in spite of a 1 yr interval between both subsets. We also use state-of-the-art stellar evolution models to constrain the evolutionary status of β Ceti. We derive a mass of 3.5 M⊚ and propose that this star is already in the central helium-burning phase. Conclusions. Considering all our results and the evolutionary status of the star, we suggest that dynamo action alone may not be efficient enough to account for the high magnetic activity of β Ceti. As an alternate option, we propose that it is a descendant of an Ap star presently undergoing central helium-burning and still exhibiting a remnant of the Ap star magnetic field. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results