The star forming regions in the Monoceros R2 molecular cloud

Details The star forming regions in the Monoceros R2 molecular cloud The star forming regions in the Monoceros R2 molecular cloud

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..238h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 238-243.

Astronomy and Astrophysics

Astronomy

14

Early Stars, Interstellar Gas, Molecular Clouds, Radio Sources (Astronomy), Spatial Distribution, Stellar Evolution, Flux Density, H Ii Regions, Infrared Radiation, Nebulae, Radio Astronomy, Water Masers

Scientific paper

In order to determine if newly formed early-type stars are present in the large molecular cloud associated with the Mon R2 cluster of reflection nebulae, the whole cloud has been scanned at 3.2 and 10.55 GHz using the 46-m radio telescope of the Algonquin Radio Observatory. The limiting flux density was 40 mJy at both frequencies, corresponding to the flux from an H II region excited by a B1 star at the 830 pc distance of Mon R2. The total solid angle covered was 0.005 sr, or 16 sq deg. Only three H II regions were definitely detected, all of which are located in the central core region, and each has been previously observed. Young stars, reflection nebulae, IR objects, and OH and H2O masers have been seen by others near the core region, but no other optical identifications of young stellar objects were made outside the core. The majority of all these objects lie close together along a line which is almost perpendicular to the galactic plane, implying that the formation of stars with spectral types ranging from B1 to B9 has only occurred in an annulus, plane, or line through the center of the cloud and nowhere else in the cloud. It appears that star formation was triggered 10 to the 7th yr ago, and Mon R2 could be an older and larger scale version of the Cep A cloud.

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