Discovery of a white dwarf companion of the 'hybrid' K giant HD 81817

Details Discovery of a white dwarf companion of the 'hybrid' K giant HD 81817 Discovery of a white dwarf companion of the 'hybrid' K giant HD 81817

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136l...5r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. L5, L6. Sponsorship: Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

8

Companion Stars, K Stars, Red Giant Stars, Stellar Evolution, Ultraviolet Spectra, White Dwarf Stars, Binary Stars, Blue Stars, Iue, Spectral Energy Distribution, Stellar Atmospheres, Stellar Mass Ejection, Stellar Spectra

Scientific paper

IUE observations show that the bright K giant HD 81817 has a faint blue companion which is identified as a white dwarf. A fit of theoretical DA model atmosphere fluxes to the observed energy distribution in the wavelength range λλ1250 Å to 1600 Å yields an effective temperature Te = 20000±2000K for the WD companion and places the WD at the same distance as the red giant. On the basis of an estimate of the giant's mass, it is argued that the white dwarf must have had a progenitor with an initial mass above ≡4 M_sun;. Finally, it is shown by comparison with θ Her that HD 81817 is a member of the 'hybrid star' class.

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