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The Inhomogeneous Wind of the LBV Candidate CygOB2-No.12 by Klochkova, Valentina; Chentsov, Eugene; Miroshnichenko, Anatoly is a scholarly article available to read on EtoBox.

What is The Inhomogeneous Wind of the LBV Candidate CygOB2-No.12 about?

We present the results of high-resolution spectroscopy of the extremely luminous star CygOB2-No.12. We identified about 200 spectral features in the range 4552-7939 AA, including the interstellar NaI, KI lines and numerous very strong DIBs, along with the HeI, CII, and SiII lines. An MK spectral type we derived for the object is B4.5Ia+. 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 Halpha emission displays broad Thompson wings, a slightly blue-shifted PCyg type absorption component and a time-variable core absorption. We conclude that the wind is variable in time.

Author

Klochkova, Valentina; Chentsov, Eugene; Miroshnichenko, Anatoly

Published

2010

Language

EN