A New Very Cool White Dwarf Discovered by the Sloan Digital Sky Survey

Details A New Very Cool White Dwarf Discovered by the Sloan Digital Sky Survey A New Very Cool White Dwarf Discovered by the Sloan Digital Sky Survey

2001-01-02

arxiv.org/abs/astro-ph/0101021v1

Astrophys.J. 549 (2001) L109-L113

Astronomy and Astrophysics

Astrophysics

15 pages, including 5 figures. Accepted for Astrophysical Journal Letters

Scientific paper

10.1086/319146

Early data taken during commissioning of the SDSS have resulted in the discovery of a very cool white dwarf. It appears to have stronger collision induced absorption from molecular hydrogen than any other known white dwarf, suggesting it has a cooler temperature than any other. While its distance is presently unknown, it has a surprisingly small proper motion, making it unlikely to be a halo star. An analysis of white dwarf cooling times suggests that this object may be a low-mass star with a helium core. The SDSS imaging and spectroscopy also recovered LHS 3250, the coolest previously known white dwarf, indicating that the SDSS will be an effective tool for identifying these extreme objects.

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