A New very cool white dwarf discovered by the Sloan Digital Sky Survey
2001
Early data taken during commissioning of the Sloan
Digital Sky Survey(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 dwarfcooling times suggests that this object may be a
low-massstar 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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