Near-IR observations of Sharpless regions. I - S269, S271, S307 and S311

Details Near-IR observations of Sharpless regions. I - S269, S271, S307 and S311 Near-IR observations of Sharpless regions. I - S269, S271, S307 and S311

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...70..437p&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 70, no. 3, Sept. 1987, p. 437-442.

Astronomy and Astrophysics

Astronomy

9

H Ii Regions, Infrared Sources (Astronomy), Molecular Clouds, Near Infrared Radiation, Early Stars, Infrared Astronomy Satellite, Radio Sources (Astronomy), Star Formation, Very Large Array (Vla)

Scientific paper

The authors have searched for near-infrared emission from the Sharpless regions S269, S271, S307 and S311. Seven sources were detected scanning areas of 2arcmin.5×2arcmin.5 around the radio continuum peaks. The source Irs 2 in S269 shows a very steep infrared energy distribution with K-L = 2.88, suggesting the presence of a very young object of luminosity L(IR) = 5.4×103L_sun;. Young objects could be present also in the complex H II region S311 as the IRAS observations show. In addition, an extended 2.2 μm emission (>2 arcmin) has been observed in this region. Finally, the near-IR observations of S271 and S307 are in agreement with the presence of visible OB stars, at the center of the nebulosity. In particular, the near-IR excess observed in S307, has been interpreted in terms of stellar wind with M= 5×10-8M_sun;/yr. This wind could affect the evolution of the H II/molecular cloud region.

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