Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006basi...34..119o&link_type=abstract
Bulletin of the Astronomical Society of India, vol. 34, Issue 2, p.119
Astronomy and Astrophysics
Astronomy
5
Ism: Clouds, Stars: Formation, Stars: Pre-Main Sequence, Open Clusters And Associations: General, Infrared: Stars
Scientific paper
We have conducted deep near-infrared surveys of the Sh-2 255, W3 Main and NGC 7538 massive star forming regions using simultaneous observations of the JHKs -band with the near-infrared camera SIRIUS on the UH 88-inch telescope. The near-infrared surveys cover a total area of ~72 square arcmin of three regions with 10-sigma limiting magnitudes of ~19.5, 18.4 and 17.3 in J, H and Ks-band, respectively. Based on the colour-colour and colour- magnitude diagrams and their clustering properties, the candidate young stellar objects are identified and their luminosity functions are constructed in Sh-2 255, W3 Main and NGC 7538. A large number of previously unreported red sources (H - K > 2) have also been detected around these regions. We argue that these red stars are most probably pre-main sequence stars with intrinsic colour excesses. The detected young stellar objects show a clear clustering pattern in each region: the Class I-like sources are mostly clustered in molecular cloud region, while the Class II-like sources in or around more evolved optical H II regions. We find that the slopes of the Ks -band luminosity functions of Sh-2 255, W3 Main and NGC 7538 are lower than the typical values reported for the young embedded clusters and their stellar populations are primarily composed of low mass pre-main sequence stars. From the slopes of the Ks -band luminosity functions, we infer that Sh-2 255, W3 Main and NGC 7538 star forming regions are rather young (age 1 Myr).
Ojha Devendra
Sirius Team
Tamura Motohide
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