SIMBAD references

2007AJ....133.1058C - Astron. J., 133, 1058-1066 (2007/March-0)

Photometry of a galactic field at l=232°, b=-6°: the old open cluster Auner 1, the Norma-Cygnus spiral arm, and the signature of the warped galactic thick disk.


Abstract (from CDS):

We perform a detailed photometric study of the stellar populations in a Galactic field at l=232°, b=-6° in the Canis Major (CMa) constellation. We present the first U, B, V, I photometry of the old open cluster Auner 1 and determine it to be ~3.25 Gyr old and to lie 8.9 kpc from the Sun. In the background of the cluster, at more than 9 kpc, we detect a young population most likely associated with the Norma-Cygnus spiral arm. Furthermore, we detect the signature of an older population and identify its turnoff and red giant branch. This population is found to have a mean age of 7 Gyr and a mean metallicity of Z=0.006. We reconstruct the geometry of the stellar distribution and argue that this older population, often associated with the CMa ``galaxy'', in fact belongs to the warped old thin- and thick-disk components along this line of sight.

Abstract Copyright:

Journal keyword(s): Galaxy: General - Stars: Hertzsprung-Russell Diagram - Galaxy: Open Clusters and Associations: General - open clusters and associations: individual (Auner 1)

CDS comments: Landolt field PG 0231+006 is a misprint for PG 0231+051

Simbad objects: 15

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