Optical spectrum of Cyg OB2 No. 12 (Klochkova+, 2004)

Details Optical spectrum of Cyg OB2 No. 12 (Klochkova+, 2004) Optical spectrum of Cyg OB2 No. 12 (Klochkova+, 2004)

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ycat..80811104k&link_type=abstract

VizieR On-line Data Catalog: J/AZh/81/1104. Originally published in: 2004AZh....81.1104K; 2004ARep..48..1005K

Physics

Stars: Blue, Stars: Variable, Equivalent Widths, Radial Velocities

Scientific paper

We have obtained the first high spectral-resolution (R=15000 and 60000) optical spectra for the extremely luminous star No.12, identified with the IR-source IRAS 20308+4104 in the Cyg OB2 association. We have identified about 200 spectral features at 4552-7939{AA}, including interstellar NaI, KI and numerous DIBs, which are in the strongest absorptions in the spectrum, along with the HeI, CII, SiII lines. A two-dimensional spectral classification indicates that the star's spectral type is B5+/-0.5 Ia+. Our analyses of the radial velocities pattern shows the presence of a radial velocity gradient in the stellar atmosphere due to the infall of matter onto the star. The strong H(alpha) emission line displays broad Thompson wings and time-variable core absorption, providing evidence that the stellar wind is inhomogeneous and slightly blue-shifted P Cygni absorption profile. We conclude that the wind is time-variable.
(1 data file).

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