Detection of a young stellar population in the background of open clusters in the Third Galactic Quadrant

Details Detection of a young stellar population in the background of open clusters in the Third Galactic Quadrant Detection of a young stellar population in the background of open clusters in the Third Galactic Quadrant

2005-08-02

arxiv.org/abs/astro-ph/0508088v1

Astrophys.J.630:L153-L156,2005

Astronomy and Astrophysics

Astrophysics

13 pages, 3 eps figure, the first one HUGELY reduced in resolution, accepted for publication as ApJ Letter

Scientific paper

10.1086/491787

We report the detection of a young stellar population ($\leq$100 Myrs) in the ba ckground of 9 young open clusters belonging to a homogenoeous sample of 30 star clusters in the Third Galactic Quadrant (at $217^o \leq l \leq 260^o$). Deep and accurate UBVRI photometry allows us to measure model-independent age and distance for the clusters and the background population with high confidence. This population is exactly the same population (the Blue Plume) recently detected in 3 intermediate-age open clusters and suggested to be a $\leq$ 1-2 Gyr old population belonging to the Canis Major (CMa) over-density (Bellazzini et al. 2004, Mart\'inez-Delgado et al. 2005). However, we find that the young population in those three and in six clusters of our sample follows remarkably well the pattern of the Norma-Cygnus spiral arm as defined by CO clouds, while in the other three program clusters it lies in the Perseus arm. We finally provide one example (out of 21) of a cluster which does not show any background population, demonstrating that this population is not ubiquitous toward CMa.

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