A model for the 89 Herculis system

We report new radial velocity measurements of the F2 supergiant 89 Her that confirm the binary nature of this star. A period search yields an orbital period of 288.4 +/- 0.7 days, in close agreement with earlier results. We also present intermediate resolution spectra in the wavelength range 3500 -...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1993-03, Vol.269 (1-2), p.242-248
Main Authors: WATERS, L. B. F. M, WAELKENS, C, MAYOR, M, TRAMS, N. R
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Normal stars (by class): general or individual
Stars
Supergiant stars
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Summary:We report new radial velocity measurements of the F2 supergiant 89 Her that confirm the binary nature of this star. A period search yields an orbital period of 288.4 +/- 0.7 days, in close agreement with earlier results. We also present intermediate resolution spectra in the wavelength range 3500 - 11,000 A, with numerous emission lines. We use the available spectroscopic and photometric data to construct a qualitative model for the circumstellar envelope of 89 Her, and suggest that it is highly nonspherical as a result of binary evolution. We discuss the evolutionary status of the 89 Her system.
ISSN:0004-6361
1432-0746