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The inhomogeneous wind of the LBV candidate Cyg OB2 No.12

Published online by Cambridge University Press:  12 July 2011

Valentina G. Klochkova ,
Eugene L. Chentsov  and
Anatoly S. Miroshnichenko
Valentina G. Klochkova
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: [email protected], [email protected]
Eugene L. Chentsov
Affiliation:
Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 369167, Russia email: [email protected], [email protected]
Anatoly S. Miroshnichenko
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina at Greensboro, P.O. Box 26170, Greensboro, NC 27402–6170, USA; email: [email protected]
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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.

Keywords

stars: supergiantsstars: circumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 400 - 401
Copyright
Copyright © International Astronomical Union 2011

References

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Panchuk, V. E., Klochkova, V. G., Yushkin, M.V., & Naidenov, I. D. 2009, Opticheskii Zhurn., 76, 42Google Scholar