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The inhomogeneous wind of the LBV candidate Cyg OB2 No.12
Published online by Cambridge University Press: 12 July 2011
Abstract
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We present the results of high-resolution spectroscopy of the extremely luminous star Cyg OB2 No. 12. We identified about 200 spectral features in the range 4552–7939 Å, including the interstellar Na I, K I lines and numerous very strong DIBs, along with the He I, C II, and Si II lines. An MK spectral type we derived for the object is B4.5±0.5 Ia+. Our analysis of the radial velocity data shows the presence of a gradient in the stellar atmosphere, caused by both atmospheric expansion and matter infall onto the star. The Hα emission displays broad Thompson wings, a slightly blue-shifted P Cyg type absorption component and a time-variable core absorption. We conclude that the wind is variable in time.
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- Copyright © International Astronomical Union 2011
References
Panchuk, V. E., Najdenov, I. D., Klochkova, V. G., Ivanchik, A. B. et al. 1997, Bull. Special Astrophys. Obs., 44, 127Google Scholar
Panchuk, V. E., Klochkova, V. G., Yushkin, M.V., & Naidenov, I. D. 2009, Opticheskii Zhurn., 76, 42Google Scholar
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