The molecular cloud-H II region complexes associated with SH 90 and SH 235

Details The molecular cloud-H II region complexes associated with SH 90 and SH 235 The molecular cloud-H II region complexes associated with SH 90 and SH 235

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124....1l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 1, July 1983, p. 1-10.

Astronomy and Astrophysics

Astrophysics

19

Astronomical Models, H Ii Regions, Interstellar Gas, Molecular Clouds, Stellar Evolution, Astronomical Maps, Interstellar Extinction, Kinematics, Radial Velocity

Scientific paper

The Sharpless regions Sh 90 and Sh 235 are characterized on the basis of monochromatic photographs (at H-alpha, N III, and O III) and H-alpha photographic interferograms made at the Observatoire de Haute-Provence and of molecular-cloud maps (at 110.201 and 89.189 GHz) made at the Observatoire de Bordeaux. Sh 90, at a distance of 2.4 kpc, is found to have an evolved-H II-region shell structure, with ionized gas flowing both away from and toward a neutral molecular cloud with a mass of about 60,000 solar mass which lies partly in front of the H II region. Sh 235, at 1.6 kpc, has two extended 100,000-300,000-solar-mass neutral clouds which partly overlap. The northern cloud, identified at -20 km/s, is related to the optical nebula; the southern cloud (at -17 km/s) contains three compact H II regions (A, B, and C) and exhibits recent star-formation processes. The 'champagne' model of H II regions proposed by Tenorio-Tagle (1979) is considered applicable to Sh 90 and to Sh 235C.

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