Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..288o&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 288-302. Research supported by the U.S. Navy and Colby College.
Astronomy and Astrophysics
Astronomy
16
B Stars, Cygnus Constellation, Far Infrared Radiation, H Ii Regions, Infrared Imagery, Radio Observation, Astronomical Photography, Extragalactic Radio Sources, Infrared Astronomy Satellite, Molecular Clouds
Scientific paper
New observations of DR 15 and 20 are reported as part of a study of compact H II regions in the Cyg X region. The radio and FIR data for these objects, when combined with (C-12)O maps, IRAS imagery, and optical photographs, provide new insights into the structure of this complex region and the nature of the star-formation process there. The observations show that DR 15 may consist of one or two B0 ZAMS stars whose H I regions have formed a low-density cavity within a molecular cloud. DR 20 appears to be a young OB cluster. The cluster is dominated by an O5.5 ZAMS star and also contains an approximately 3500-yr-old B0 star appearing as a compact H II region, along with weak FIR sources that may be B0-star candidates.
Campbell Marvin F.
Fazio Giacomo
Moseley Harvey
Odenwald Sten F.
Schwartz Pavol
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