The end of the white dwarf cooling sequence in M 67

Details The end of the white dwarf cooling sequence in M 67 The end of the white dwarf cooling sequence in M 67

2010-01-21

arxiv.org/abs/1001.3827v1

A&A, 513A, 2010 50B

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 8 figures, 1 table. Accepted for publication in Astronomy and Astrophysics on January 20, 2010

Scientific paper

10.1051/0004-6361/200913721

In this paper, we present for the first time a proper-motion-selected white dwarf (WD) sample of the old Galactic open cluster M 67, down to the bottom of the WD cooling sequence (CS). The color-magnitude diagram is based on data collected with the LBC-Blue camera at the prime focus of LBT. As first epoch data, we used CFHT-archive images collected 10 years before LBC data. We measured proper motions of all the identified sources. Proper motions are then used to separate foreground and background objects from the cluster stars, including WDs. Finally, the field-object cleaned WD CS in the V vs. B-I color-magnitude diagram is compared with the models. We confirm that the age derived from the location of the bottom of the WD CS is consistent with the turn off age.

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