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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 ,
Artemio Herrero ,
E. Santolaya-Rey ,
A. Kaufer ,
F. Musaev ,
G. Galazutdinov  and
A. Galeev
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

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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
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 69 - 70
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

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