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81 results on '"Laney, C D"'

51. Galactic abundance gradients from Cepheids

Author

Lemasle, B., primary, François, P., additional, Piersimoni, A., additional, Pedicelli, S., additional, Bono, G., additional, Laney, C. D., additional, Primas, F., additional, and Romaniello, M., additional

Published
2008
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55. On the α-element gradients of the Galactic thin disk using Cepheids.

Author

Genovali, K., Lemasle, B., da Silva, R., Bono, G., Fabrizio, M., Bergemann, M., Buonanno, R., Ferraro, I., François, P., Iannicola, G., Inno, L., Laney, C. D., Kudritzki, R. -P., Matsunaga, N., Nonino, M., Primas, F., Romaniello, M., Urbaneja, M. A., and Thévenin, F.

Subjects
DISK galaxies, CEPHEIDS, COSMIC abundances, SIGNAL-to-noise ratio, SUPERNOVAE, ASTRONOMICAL spectroscopy, SUPERGIANT stars
Abstract

We present new homogeneous measurements of Na, Al, and three α-elements (Mg, Si, Ca) for 75 Galactic Cepheids. The abundances are based on high spectral resolution (R ~ 38 000) and high signal-to-noise ratio (S/N ∼ 50-300) spectra collected with UVES at ESO VLT. The current measurements were complemented with Cepheid abundances provided by our group (75) or available in the literature, for a total of 439 Galactic Cepheids. Special attention was given to providing a homogeneous abundance scale for these five elements plus iron. In addition, accurate Galactocentric distances (RG) based on near-infrared photometry are also available for all the Cepheids in the sample. They cover a large section of the Galactic thin disk (4.1 ≤ RG ≤ 18.4 kpc). We found that these five elements display well-defined linear radial gradients and modest standard deviations over the entire range of RG. Moreover, the [element/Fe] abundance ratios are constant across the entire thin disk; only the Ca radial distribution shows marginal evidence of a positive slope. These results indicate that the chemical enrichment history of iron and of the quoted five elements has been quite similar across the four quadrants of the Galactic thin disk. The [element/Fe] ratios are also constant over the entire period range. This empirical evidence indicates that the chemical enrichment of Galactic Cepheids has also been very homogenous within the range in age that they cover (~10-300 Myr). Once again, [Ca/Fe] vs. log P shows a (negative) gradient, since it is underabundant among the youngest Cepheids. Finally, we also find that Cepheid abundances agree quite well with similar abundances for thin and thick disk dwarf stars, and they follow the typical Mg-Al and Na-O correlations. [ABSTRACT FROM AUTHOR]

Published
2015
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56. Pulsations in beta Pictoris

Author

Koen, C., primary, Balona, L. A., additional, Khadaroo, K., additional, Lane, I., additional, Prinsloo, A., additional, Smith, B., additional, and Laney, C. D., additional

Published
2003
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66. Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data

Author

Stirpe, G. M., primary, Winge, C., additional, Altieri, B., additional, Alloin, D., additional, Aguero, E. L., additional, Anupama, G. C., additional, Ashley, R., additional, Bertram, R., additional, Calderon, J. H., additional, Catchpole, R. M., additional, Corradi, R. L. M., additional, Covino, E., additional, Dottori, H. A., additional, Feast, M. W., additional, Ghosh, K. K., additional, Hutton, R. Gil, additional, Glass, I. S., additional, Grebel, E. K., additional, Jorda, L., additional, Koen, C., additional, Laney, C. D., additional, Maia, M., additional, Marang, F., additional, Mayya, Y. D., additional, Morrell, N., additional, Nakada, Y., additional, Pastoriza, M. G., additional, Pati, A. K., additional, Pelat, D., additional, Peterson, B. M., additional, Prabhu, T. P., additional, Roberts, G., additional, Sagar, R., additional, Salamanca, I., additional, Sekiguchi, K., additional, Storchi-Bergmann, T., additional, Subramaniam, A., additional, Van Winckel, H., additional, van Wyk, F., additional, Villada, M., additional, Wagner, R. M., additional, Whitelock, P. A., additional, Winkler, H., additional, Clavel, J., additional, Dietrich, M., additional, Kollatschny, W., additional, O'Brien, P. T., additional, Perola, G. C., additional, Recondo-Gonzalez, M. C., additional, Rodriguez-Pascual, P., additional, and Santos-Lleo, M., additional

Published
1994
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70. A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars.

Author

Laney, C. D., Joner, M. D., and Pietrzyński, G.

Subjects
*BRIGHTEST stars, *CEPHEIDS, *ASTRONOMICAL observations, *STARS, *MEASUREMENT of distances, *MAGELLANIC clouds
Abstract

ABSTRACT High-precision () new JHK observations of 226 of the brightest and nearest red clump stars in the solar neighbourhood are used to determine distance moduli for the Large Magellanic Cloud (LMC). The resulting K- and H-band values of 18.47 ± 0.02 and 18.49 ± 0.06 imply that any correction to the K-band Cepheid PL relation due to metallicity differences between Cepheids in the LMC and the solar neighbourhood must be quite small. [ABSTRACT FROM AUTHOR]

Published
2012
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71. Erratum: The 1989 outburst of the recurrent nova V745 Sco

Author

Sekiguchi, K., primary, Whitelock, P. A., additional, Feast, M. W., additional, Barrett, P. E., additional, Caldwell, J. A. R., additional, Carter, B. S., additional, Catchpole, R. M., additional, Laing, J. D., additional, Laney, C. D., additional, Marang, F., additional, and van Wyk, F., additional

Published
1991
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72. On the relative distance of Magellanic Clouds using Cepheid NlR and Optical-NIR PW relations

Author

Inno, L., Bono, G., Matsunaga, N., Romaniello, M., Primas, F., Buonanno, R., Caputo, F., Genovali, K., Laney, C. D., Marconi, M., and Adriano Pietrinferni

Subjects
Astrophysics - Solar and Stellar Astrophysics, FOS: Physical sciences, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

We present new estimates of the relative distance of the Magellanic Clouds (MCs) by using NIR and Optical-NIR Cepheid Period Wesenheit (PW) relations. The relative distances are independent of uncertainties affecting the zero-point of the PW relations, but do depend on the adopted pivot periods. We estimated the pivot periods for fundamental (FU) and first overtone (FO) Cepheids on the basis of their period distributions. We found that log P=0.5 (FU) and log P=0.3 (FO) are solid choices, since they trace a main peak and a shoulder in LMC and SMC period distributions. By using the above pivot periods and ten PW relations, we found MC relative distances of 0.53$\pm$0.06 (FU) and 0.53$\pm$0.07 (FO) mag. Moreover, we investigated the possibility to use mixed-mode (FU/FO, FO/SO) Cepheids as distance indicators and we found that they follow quite well the PW relations defined by single mode MC Cepheids, with deviations typically smaller than 0.3{\sigma}., Comment: Proceeding of the conference: EWASS 2012 - Stellar Populations: 55 years after the Vatican conference

75. Spectroscopic and photometric observations of SN 1987A – III. Days 135 to 260

Author

Catchpole, R. M., primary, Whitelock, P. A., additional, Feast, M. W., additional, Menzies, J. w., additional, Glass, I. S., additional, Marang, F., additional, Laing, J. D., additional, Spencer Jones, J. H., additional, Roberts, G., additional, Balona, L. A., additional, Carter, B. S., additional, Laney, C. D., additional, Evans, Lloyd T., additional, Sekiguchi, K., additional, Hutchinson, M. G., additional, Maddison, R., additional, Albinson, J., additional, Evans, A., additional, Allen, D. A., additional, Winkler, H., additional, Fairall, A., additional, Corbally, C., additional, Davies, J. K., additional, and Parker, Q. A., additional

Published
1988
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76. Spectroscopic and photometric observations of SN1987A – V. Days 386–616

Author

Catchpole, R. M., primary, Whitelock, P. A., additional, Menzies, J. W., additional, Feast, M. W., additional, Marang, F., additional, Sekiguchi, K., additional, van Wyk, F., additional, Roberts, G., additional, Balona, L. A., additional, Egan, J. M., additional, Carter, B. S., additional, Laney, C. D., additional, Laing, J. D., additional, Spencer Jones, J. H., additional, Glass, I. S., additional, Winkler, H., additional, Fairall, A. P., additional, Lloyd Evans, T. H. H., additional, Cropper, M. S., additional, Shenton, M., additional, Hill, P. W., additional, Payne, P., additional, Jones, K. N., additional, Wargau, W., additional, Mason, K. O., additional, Jeffery, C. S., additional, Hellier, C., additional, Parker, Q. A., additional, Chini, R., additional, James, P. A., additional, Doyle, J. G., additional, Butler, C. J., additional, and Bromage, G., additional

Published
1989
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77. Spectroscopic and photometric observations of SN 1987a-II. Days 51 to 134

Author

Catchpole, R. M., primary, Menzies, J. W., additional, Monk, A. S., additional, Wargau, W. F., additional, Pollaco, D., additional, Carter, B. S., additional, Whitelock, P. A., additional, Marang, F., additional, Laney, C. D., additional, Balona, L. A., additional, Feast, M. W., additional, Lloyd Evans, T. H. H., additional, Sekiguchi, K., additional, Laing, J. D., additional, Kilkenny, D. M., additional, Spencer Jones, J., additional, Roberts, G., additional, Cousins, A. W. J., additional, van Vuuren, G., additional, and Winkler, H., additional

Published
1987
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78. Spectroscopic and photometric observations of SN 1987A-IV. Days 260-385

Author

Whitelock, P. A., primary, Catchpole, R. M., additional, Menzies, J. W., additional, Feast, M. W., additional, Winkler, H., additional, Marang, F., additional, Glass, I. S., additional, Balona, L. A., additional, Egan, J., additional, Carter, B. S., additional, Roberts, G., additional, Sekiguchi, K., additional, Laney, C. D., additional, Lloyd Evans, T., additional, Laing, J. D., additional, Spencer Jones, J., additional, Fernley, J., additional, James, P., additional, Fairall, A. P., additional, Monk, A. S., additional, and van Wyk, F., additional

Published
1988
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79. Spectroscopic and photometric observations of SN1987A - VI. Days 617 to 792

Author

Whitelock, P. A., primary, Catchpole, R. M., additional, Menzies, J. W., additional, Feast, M. W., additional, Woosley, S. E., additional, Allen, D. A., additional, van Wyk, F., additional, Marang, F., additional, Laney, C. D., additional, Winkler, H., additional, Sekiguchi, K., additional, Balona, L. A., additional, Carter, B. S., additional, Spencer Jones, J. H., additional, Laing, J. D., additional, Evans, T. L., additional, Fairall, A. P., additional, Buckley, D. A. H., additional, Glass, I. S., additional, Penston, M. V., additional, da Costa, L. N., additional, Bell, S. A., additional, Hellier, C., additional, Shara, M., additional, and Moffat, A. F. J., additional

Published
1989
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81. Spectroscopic and photometric observations of SN 1987a: the first 50 days

Author

Menzies, J. W., primary, Catchpole, R. M., additional, van Vuuren, G., additional, Winkler, H., additional, Laney, C. D., additional, Whitelock, P. A., additional, Cousins, A. W. J., additional, Carter, B. S., additional, Marang, F., additional, Lloyd Evans, T. H. H., additional, Roberts, G., additional, Kilkenny, D., additional, Spencer Jones, J., additional, Sekiguchi, K., additional, Fairall, A. P., additional, and Wolstencroft, R. D., additional

Published
1987
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