2010/01/21 by A. Bellini, Andrea Bellini, L. R. Bedin +29 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/200913721
published as A&A, 513A, 2010 50B · 11 pages, 8 figures, 1 table. Accepted for publication in Astronomy and Astrophysics on January 20, 2010
arxiv created 2010/01/21 · openalex publication_date 2010/02/08 · arxiv updated 2010/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
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 <i>V<i/> vs. <i>B<i/>–<i>I<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.