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WD 0346+246
WD 0346+246 is a white dwarf. It was discovered in 1997 when examination of photographs taken for a survey of brown dwarfs in the Pleiades revealed a faint star with high proper motion. It is one of the coolest white dwarfs known, with an effective temperature estimated to be approximately 3900 K equaling to a spectral type of M0.〔(WD 0346+246: A Very Low Luminosity, Cool Degenerate in Taurus ), N. C. Hambly, S. J. Smartt, and S. Hodgkin, ''Astrophysical Journal Letters'' 489 (November 1997), pp. L157–L160.〕
Recent studies using NASA's Spitzer Space Telescope and MDM Observatory's 2.4-meter telescope (near Tucson, Arizona, USA) shows that this white dwarf (together with another one: SDSS J110217, 48+411315.4) has a lowest (for white dwarfs) surface temperature about 3700 and 3800 degrees K due to the age of 11 to 12 billion years.
〔http://www.spacedaily.com/reports/12_Billion_Year_Old_White_Dwarf_Stars_Only_100_Light_Years_Away_999.html〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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