The halo white dwarf population

Details The halo white dwarf population The halo white dwarf population

1998-02-21

arxiv.org/abs/astro-ph/9802278v1

Astrophys.J. 503 (1998) 239

Astronomy and Astrophysics

Astrophysics

29 pages (AASTeX), 7 eps figures included, accepted for publication in ApJ

Scientific paper

10.1086/305977

Halo white dwarfs can provide important information about the properties and evolution of the galactic halo. In this paper we compute, assuming a standard IMF and updated models of white dwarf cooling, the expected luminosity function, both in luminosity and in visual magnitude, for different star formation rates. We show that a deep enough survey (limiting magnitude > 20) could provide important information about the halo age and the duration of the formation stage. We also show that the number of white dwarfs produced using the recently proposed biased IMFs cannot represent a large fraction of the halo dark matter if they are constrained by the presently observed luminosity function. Furthermore, we show that a robust determination of the bright portion of the luminosity function can provide strong constraints on the allowable IMF shapes.

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