Does Cyg OB2 harbour any open cluster?

Details Does Cyg OB2 harbour any open cluster? Does Cyg OB2 harbour any open cluster?

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...405..991b&link_type=abstract

Astronomy and Astrophysics, v.405, p.991-998 (2003)

Astronomy and Astrophysics

Astrophysics

33

Open Clusters And Associations: General

Scientific paper

We report the detection of three new open cluster candidates located in Cygnus. Two of them are projected near the center of the rich compact association Cyg OB2. These two objects have been found during an optical inspection of that region with Digitized Sky Survey images. Using 2MASS photometry we determined their fundamental parameters. We assumed an age of 1-4 Myr and obtained a distance from the Sun d_sun = 1.8 +/- 0.2 kpc for both objects. Reddening values for Objects 1 and 2 are E(B-V) = 2.12 +/- 0.06 and E(B-V)=1.82+/-0.06, respectively. A normal luminosity function is observed down to A0 stars, similar to that of NGC 6910. The two open cluster candidates may form a physical pair in Cyg OB2, similar to Tr 14/Tr 16 in Car OB1. Subsequently, we carried out a systematic search with 2MASS in a region 3degx3deg encompassing Cyg OB2. A third uncatalogued object resulted from this search which is projected just outside Cyg OB2.

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