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162
SIRIUS Observations of Massive Star
Forming Region: W3 Main and NGC 7538
Devendra K. OJHA
Tata Institute of Fundamental Research, Homi
Bhabha Road, Colaba, Mumbai-400 005, India
Motohide TAMURA
National Astronomical Observatory, Mitaka,
Tokyo 181ῌ8588, Japan
Abstract : We report near-infrared (JHKs-band
simultaneous) observations of two massive star
forming regions (SFRs), W3 Main and NGC
7538 regions. A number of new YSO candidates
are found and infrared nebulae associated with
YSOs are detected; some show intricate color
variations and morphology. A several hundreds
of low-mass YSOs are formed with the formation
of massive YSOs. Based on NIR-color classification, we found that each group of these YSOs
shows clearly separate spatial distributions; Class
I-like protostars distribute toward the dense
cloud regions and Class II-like YSOs around or
in optical (di#use) HII regions. The distribution
in NGC 7538 is most likely to be a signature of
sequential star formation process.
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