The spectral variations of the O-type runaway supergiant HD 188209
Mon.Not.Roy.Astron.Soc. 316 (2000) 407 We report spectral time series of the late O-type runaway supergiant HD 188209. Radial velocity variations of photospheric absorption lines with a possible quasi-period ~ 6.4 days have been detected in high-resolution echelle spectra. Night-to-night variations...
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Main Authors | , , , , , , |
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Format | Journal Article |
Language | English |
Published |
21.02.2000
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Subjects | |
Online Access | Get full text |
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Summary: | Mon.Not.Roy.Astron.Soc. 316 (2000) 407 We report spectral time series of the late O-type runaway supergiant HD
188209. Radial velocity variations of photospheric absorption lines with a
possible quasi-period ~ 6.4 days have been detected in high-resolution echelle
spectra. Night-to-night variations in the position and strength of the central
emission reversal of the Ha profile occuring over ill-defined time-scales have
been observed. The fundamental parameters of the star have been derived using
state-of-the-art plane--parallel and unified non-LTE model atmospheres, these
last including the mass-loss rate. The derived helium abundance is moderately
enhanced with respect to solar, and the stellar masses are lower than those
predicted by the evolutionary models. The binary nature of this star is not
suggested either from Hipparcos photometry or from radial velocity curves. |
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DOI: | 10.48550/arxiv.astro-ph/0002396 |