We report the detection of a young stellar population (≤ 100 Myrs) in the background of nine open clusters in the Third Galactic Quadrant. We find that the young background population in six cluster fields follows remarkably well the expected pattern of the Norma-Cygnus spiral arm as defined by CO clouds. This population is exactly the same (the Blue Plume) recently detected in the direction of 3 intermediate-age open clusters in the same region, and suggested to be a 1-2 Gyr old population belonging to the Canis Major over-density1,2. Both, distances and ages we find are incompatible with this scenario.
What's Going on in Canis Major?
CARRARO, GIOVANNI;
2006
Abstract
We report the detection of a young stellar population (≤ 100 Myrs) in the background of nine open clusters in the Third Galactic Quadrant. We find that the young background population in six cluster fields follows remarkably well the expected pattern of the Norma-Cygnus spiral arm as defined by CO clouds. This population is exactly the same (the Blue Plume) recently detected in the direction of 3 intermediate-age open clusters in the same region, and suggested to be a 1-2 Gyr old population belonging to the Canis Major over-density1,2. Both, distances and ages we find are incompatible with this scenario.
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