The Massive Star Forming Region, Cygnus OB2

Details The Massive Star Forming Region, Cygnus OB2 The Massive Star Forming Region, Cygnus OB2

2009-09-25

arxiv.org/abs/0909.4613v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 3 figures. To appear in the proceedings of IAU Symposium 266, Star Clusters: Basic Galactic Building Blocks Throughou

Scientific paper

We present results from a catalogue of 1696 X-ray point sources detected in the massive star forming region (SFR) Cygnus OB2, the majority of which have optical or near-IR associations. We derive ages of 3.5 and 5.25 Myrs for the stellar populations in our two fields, in agreement with recent studies that suggest that the central 1-3 Myr OB association is surrounded and contaminated by an older population with an age of 5-10 Myrs. The fraction of sources with proto-planetary disks, as traced by K-band excesses, are unusually low. Though this has previously been interpreted as due to the influence of the large number of OB stars in Cyg OB2, contamination from an older population of stars in the region could also be responsible. An initial mass function is derived and found to have a slope of Gamma = -1.27, in agreement with the canonical value. Finally we introduce the recently approved Chandra Cygnus OB2 Legacy Survey that will image a 1 square degree area of the Cygnus OB2 association to a depth of 120 ks, likely detecting ~10,000 stellar X-ray sources.

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