The old anticentre open cluster Berkeley 32: membership and fundamental parameters

Abstract

We have obtained medium-low resolution spectroscopy and BVI CCD imaging of Berkeley 32, an old open cluster which lies in the anticentre direction. From the radial velocities of 48 stars in the cluster direction we found that 31 of them, in crucial evolutionary phases, are probable cluster members, with an average radial velocity of +106.7 (sigma = 8.5) km/s. From isochrone fitting to the colour magnitude diagrams of Berkeley 32 we have obtained an age of 6.3 Gyr, (m-M)0 = 12.48 and E(B-V) = 0.10. The best fit is obtained with Z=0.008. A consistent distance, (m-M)0 ~= 12.6 +/- 0.1, has been derived from the mean magnitude of red clump stars with confirmed membership; we may assume (m-M)0 ~= 12.55 +/- 0.1. The colour magnitude diagram of the nearby field observed to check for field stars contamination looks intriguingly similar to that of the Canis Major overdensity.

MNRAS, in press. Degraded resolution for Fig. 4

References in corpus (11)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
• A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion onto the Milky Way
• Population effects on the Red Giant Clump absolute magnitude, and distance determinations to nearby galaxies
• One Ring to Encompass them All: A giant stellar structure that surrounds the Galaxy
• The age of the oldest Open Clusters
• Probing the Canis Major stellar over-density as due to the Galactic warp
• Detection of the Canis Major galaxy at (l;b)=(244;-8) and in the background of Galactic open clusters
• The core of the Canis Major galaxy as traced by Red Clump stars
• Berkeley 29, the most distant old open cluster
• Radial velocities and membership of stars in the old, distant open cluster Berkeley 29

Cited by in corpus (8)

• Elemental Abundance Ratios in Stars of the Outer Galactic Disk. IV. A New Sample of Open Clusters
• Chemical abundance analysis of the Open Clusters Berkeley 32, NGC 752, Hyades and Praesepe
• Ages and masses of million Galactic disk main sequence turn-off and sub-giant stars from the LAMOST Galactic spectroscopic surveys
• Ages and Masses of 0.64 million Red Giant Branch stars from the LAMOST Galactic Spectroscopic Survey
• The old open clusters Berkeley 32 and King 11
• Identification, mass and age of primary red clump stars from spectral features derived with the LAMOST DR7
• Membership and lithium in the old, metal-poor open cluster Berkeley 32
• Old open clusters as key tracers of Galactic chemical evolution. I. Fe abundances in NGC 2660, NGC 3960, and Berkeley 32