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Tom Mazanec
2012-Jan-02, 06:11 PM
What temperature are the oldest white dwarfs in the universe? What spectral class would be analogous?

StupendousMan
2012-Jan-02, 09:40 PM
Well, you can read about what might be the oldest white dwarfs found in the local region of the Milky Way at

http://adsabs.harvard.edu/abs/2010ApJ...715L..21K

The abstract suggests that the stars are 9-10 Gyr old. Their spectra are featureless, and therefore are given a spectral type of "DC". The paper finds temperatures of 3700-4100 K for these stars.