A Precision White Dwarf Cooling Age for NGC 6397

Details A Precision White Dwarf Cooling Age for NGC 6397 A Precision White Dwarf Cooling Age for NGC 6397

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10850r&link_type=abstract

HST Proposal ID #10850. Cycle 15

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Scientific paper

We propose to obtain second epoch imaging of the globular cluster NGC 6397 to enable the construction of a proper motion - cleaned white dwarf cooling sequence reaching fainter than the observed truncation point of the white dwarf luminosity function; a byproduct will be absolute proper motions relative to the extragalactic reference frame of the rich spheroid field population. Our data appears to show the long sought ``blue hook'', a feature in the WD cooling sequence predicted in theoretical white dwarf models; the improved photometry and statistics afforded by the second epoch observations are needed to confirm the blue hook and to test other aspects of white dwarf cooling models. The proposed observations will provide formal constraints on the age and formation timescale of NGC 6397 that will be smaller than 1 Gyr. The final proper motion-purified white dwarf sequence will be a powerful constraint for white dwarf cooling models and atmospheres, the basis for white dwarf-based globular cluster age determinations.

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