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The runaway supergiant HD 188209 (O9.5Iab): a binary or a pulsating star?

Published online by Cambridge University Press:  25 May 2016


Garik Israelian
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
Artemio Herrero
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
E. Santolaya-Rey
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
A. Kaufer
Affiliation:
Landessternwarte Königstuhl, D-69117 Heidelberg, Germany
F. Musaev
Affiliation:
Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 357147, Russia
G. Galazutdinov
Affiliation:
Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 357147, Russia
A. Galeev
Affiliation:
Special Astrophysical Observatory of the Russian AS, Nizhnij Arkhyz 357147, Russia Department of Astronomy, Kazan State University, Kazan, Kremlevskaja Str., 420008, Russia


Abstract

We report radial velocity studies of photospheric absorption lines from spectral time series of the late O-type runaway supergiant HD 188209. Radial velocity variations with a quasi-period ∼ 2 days have been detected in high-resolution echelle spectra and most probably indicate that the supergiant is pulsating. Night-to-night variations in the position and strength of the central emission reversal of the Hα profile 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 binary nature of this star is not suggested either from Hipparcos photometry or from radial-velocity curves.


Type
Part 1. Basic observational properties of Wolf-Rayet stars and other hot massive stars
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Haser, S., 1995, Dissertation Universität München Google Scholar
Herrero, A., Kudritzki, R.P., Vilchez, J.M., Kunze, D., Butler, K., Haser, S. 1992, A&A 261, 209 Google Scholar
Howarth, J., Prinja, R. 1989, ApJS 69, 527 CrossRefGoogle Scholar
Santolaya-Rey, E., Puls, J., Herrero, A. 1997, A&A 323, 488 Google Scholar
Stone, R. 1982, ApJ 261, 208 CrossRefGoogle Scholar

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The runaway supergiant HD 188209 (O9.5Iab): a binary or a pulsating star?
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