Theta Hya: Spectroscopic identification of a second B star + white dwarf binary

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dc.creatorBurleigh, M. R.
dc.creatorBarstow, M. A.
dc.date1998-10-07
dc.date.accessioned2026-07-07T02:28:16Z
dc.date.available2026-07-07T02:28:16Z
dc.descriptionWe report the identification, in an Extreme Ultraviolet Explorer (EUVE) spectrum, of a hot white dwarf companion to the 3rd magnitude late-B star Theta Hya (HR3665, HD79469). This is the second B star + white dwarf binary to be conclusively identified; Vennes, Berghofer and Christian (1997), and Burleigh and Barstow (1998) had previously reported the spectroscopic discovery of a hot white dwarf companion to the B5V star y Pup (HR2875). Since these two degenerate stars must have evolved from main sequence progenitors more massive than their B star companions, they can be used to place observational lower limits on the maximum mass for white dwarf progenitors, and to investigate the upper end of the initial-final mass relation. Assuming a pure hydrogen composition, we constrain the temperature of the white dwarf companion to Theta Hya to lie between 25,000K and 31,000K. We also predict that a third bright B star, 16 Dra (B9.5V), might also be hiding an unresolved hot white dwarf companion.
dc.description4 pages, 1 figure. Accepted for publication in Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9810113
dc.identifierhttp://arxiv.org/abs/astro-ph/9810113
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13052
dc.subjectAstrophysics
dc.titleTheta Hya: Spectroscopic identification of a second B star + white dwarf binary
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