New white dwarfs for the stellar initial mass-final mass relation

Details New white dwarfs for the stellar initial mass-final mass relation New white dwarfs for the stellar initial mass-final mass relation

2010-12-24

arxiv.org/abs/1012.5342v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

17th European White Dwarf Workshop, Tuebingen 2010, AIP Conf. Proc. 1273, 31

Scientific paper

We present the preliminary results of a survey of the open clusters NGC3532 and NGC2287 for new white dwarf members which can help improve understanding of the form of the upper end of the stellar initial mass-final mass relation. We identify four objects with cooling times, distances and proper motions consistent with membership of these clusters. We find that despite a range in age of ~100Myr the masses of the four heaviest white dwarfs in NGC3532 span the narrow mass interval M~0.9-1.0Msolar suggesting that the initial mass-final mass relation is relatively flatter over 4.5Msolar <~ M_init <~ 6.5Msolar than at immediately lower masses. Additionally, we have unearthed WD J0646-203 which is possibly the most massive cluster white dwarf identified to date. With M~1.1Msolar it seems likely to be composed of ONe and has a cooling time consistent with it having evolved from a single star.

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