The end of the white dwarf cooling sequence in M 67

Abstract

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.

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

References in corpus (7)

• Ground-Based CCD Astrometry with Wide Field Imagers. I. [Observations just a few years apart allow decontamination of field objects from members in two Globular clusters.]
• Ground-based CCD astrometry with wide field imagers. II. A star catalogue for M67: [email protected] MPG/ESO astrometry, FLAMES@VLT radial velocities
• The performance of the blue prime focus Large Binocular Camera at the Large Binocular Telescope
• Reaching the End of the White Dwarf Cooling Sequence in NGC 6791
• The Puzzling White Dwarf Cooling Sequence in NGC6791: A Simple Solution
• A new detailed examination of white dwarfs in NGC3532 and NGC2287
• Absolute proper motion of the Galactic open cluster M67

Cited by in corpus (3)

• Absolute proper motion of the Galactic open cluster M67
• Ground-based CCD astrometry with wide field imagers. IV. An improved Geometric Distortion Correction for the Blue prime-focus Camera at the LBT
• Time-resolved Spectroscopy of the Polar EU Cancri in the Open Cluster Messier 67