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In Search of the Coolest White Dwarfs – Evalyn I.Gates

Date: Tue. October 14th, 2008, 11:30 am-12:30 pm
Location: Rockefeller 221

Cool white dwarf stars are among the oldest objects in the Galaxy. These relics of an ancient stellar population offer a window into the early stages of the galaxy and its formation, and more data on the oldest and coolest white dwarfs may help resolve the interpretation of microlensing searches for MACHOs in the galactic halo. The Sloan Digital Sky Survey (SDSS) and the SEGUE program of SDSS-II are ideally suited to a search for these rare objects, and to date we have discovered 13 new ultracool white dwarfs =96 those with temperatures below 4000K =96 constituting the majority of these faint stellar fossils.

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