Sh 2-128, an H II and Star Forming Region in an Unlikely Place

Details Sh 2-128, an H II and Star Forming Region in an Unlikely Place Sh 2-128, an H II and Star Forming Region in an Unlikely Place

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jkas...37..285b&link_type=abstract

Journal of the Korean Astronomical Society, vol. 37, no. 4, pp. 285-288

Other

Ism: Individual (Sh 2-128), Ism: H Ii Regions, Stars: Formation

Scientific paper

Near-infrared imaging photometry supplemented by optical spectroscopy and narrow-band imaging of the H II region Sh 2-128 and its environment are presented. This region contains a developed H II region and the neighboring compact H II region S 128N associated with a pair of water maser sources. Midway between these, the core of a CO cloud is located. The principal ionizing source of Sh 2-128 is an O7 star close to its center. A new spectroscopic distance of 9.4 kpc is derived, very similar to the kinematic distance to the nebula. This implies a galactocentric distance of 13.5 kpc and z = 550 pc. The region is optically thin with abundances close to those predicted by galactocentric gradients. The JHKs images show that S 128N contains several infrared point sources and nebular emission knots with large near-infrared excesses. One of the three red Ks knots coincides with the compact H II region. A few of the infrared-excess objects are close to known mid- and far-infrared emission peaks. Star counts in J and Ks show the presence of a small cluster of B-type stars, mainly associated with S 128N. The JHKs photometric properties together with the characteristics of the other objects in the vicinity suggest that Sh 2-128 and S 128N constitute a single complex formed from the same molecular cloud, with ages ˜ 106 and < 3 × 105 years respectively. No molecular hydrogen emission was detected at 2.12 μm. The origin of this remote star forming region is an open problem.

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