Evolution of helium white dwarfs with hydrogen envelopes
نویسندگان
چکیده
منابع مشابه
The evolution of helium white dwarfs I .
We present a grid of evolutionary tracks for low-mass white dwarfs with helium cores in the mass range from 0.179 to 0.414 M . The lower mass limit is well-suited for comparison with white dwarf companions of millisecond pulsars. The tracks are based on a 1 M model sequence extending from the pre-main sequence stage up to the tip of the red-giant branch. Applying large mass loss rates at approp...
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We calculated a grid of evolutionary models for white dwarfs with helium cores (He-WDs) and investigated the occurrence of hydrogen-shell flashes due to unstable hydrogen burning via CNO cycling. Our calculations show that such thermal instabilities are restricted to a certain mass range (M ≈ 0.21 . . . 0.30M ), consistent with earlier studies. Models within this mass range undergo the more hyd...
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We examine the theoretical implications of a population of low-mass heliumcore white dwarfs in globular clusters. In particular, we focus on the observed population in the core of NGC 6397, where several low-mass white dwarf canditates have been identified as “non-flickerers” by Cool and collaborators. Age and mass estimates from cooling models, combined with dynamical and evolutionary consider...
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Binary evolution predicts a population of helium core (M < 0.5 M⊙) white dwarfs (WDs) that are slowly accreting hydrogen-rich material from low mass main sequence or brown dwarf donors with orbital periods less than four hours. Four binaries are presently known in the Milky Way that will reach such a mass-transferring state in a few Gyr. Despite these predictions and observations of progenitor ...
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The origin of highly magnetized white dwarfs has remained a mystery since their initial discovery. Recent observations indicate that the formation of high-field magnetic white dwarfs is intimately related to strong binary interactions during post-main-sequence phases of stellar evolution. If a low-mass companion, such as a planet, brown dwarf, or low-mass star, is engulfed by a post-main-sequen...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1998
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-8711.1998.01116.x