Astrophys. J., 596, 1064-1079 (2003/October-3)
A near-infrared study of the star-forming region S269.
JIANG Z., YAO Y., YANG J., BABA D., KATO D., KURITA M., NAGASHIMA C., NAGATA T., NAGAYAMA T., NAKAJIMA Y., ISHII M., TAMURA M. and SUGITANI K.
Abstract (from CDS):
The star-forming region S269 is studied with deep JHKs and H2v=1-0 S(1) images and K-band spectroscopy. The JHKsimages reveal a rich embedded cluster at the center of the field; most stars in the cluster are located in two major congregations. The colors of the two congregations and of the associated nebulosities are quite different. The color-color diagrams and color-magnitude diagrams of the two subgroups show that their intrinsic colors are not significantly different, suggesting that they could be formed at a similar age. Between the subgroups there are two near-infrared sources, IRS 2e and 2w. Their K-band spectra rise toward longer wavelengths, indicative of a dense dusty envelope surrounding them. Strong H2and Brγ lines are detected on these two objects. A poorly collimated bipolar H2jet has been detected around IRS 2e and 2w. The morphology of the infrared jet and K-band spectra of the two infrared sources suggest that the jet is likely driven by IRS 2e or 2w, or both. Several lines of evidence suggest that IRS 2e and 2w are massive young stellar objects probably younger than most of the stars in the region. Given the facts above, we speculate that lower mass star-forming activities in a stellar cluster could play an important role in the formation of a massive star.
ISM: H II Regions - Infrared: ISM - ISM: Individual: Alphanumeric: S269 - ISM: Lines and Bands - Stars: Formation
VizieR on-line data:
<Available at CDS (J/ApJ/596/1064): table1.dat>
Table 1: [JYY2003] NIR NNN (Nos 1-367). Table 2: [JYY2003] H2 N (Nos 1-6).
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