Low-mass star formation in the dense interior of Barnard 18

Abstract

view Abstract Citations (23) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Low-mass star formation in the dense interior of Barnard 18. Myers, P. C. Abstract CO observations, visible obscuration, and near-IR estimates of extinction in Barnard 18 indicate that the relatively dense visibly opaque region (with an H2 density of 3000 per cu cm) is associated with a less dense nearly transparent region (with an H2 density of 700 per cu cm) of greater spatial extent (2 pc x 5 pc). A two-component model and measurements of stellar extinction indicate that the dense inner gas has nine known stars, a star formation efficiency of 2%, and a star space density of 8 per cu pc, while the less dense gas has eight known stars, a star formation efficiency of 1%, and a star space density of 0.9 per cu pc. Therefore, these young (300,000 years) low-mass stars are preferentially located in the dense inner gas. Calculations of escape speed and estimates of stellar speed indicate that most of the stars are probably gravitationally bound by the cloud. Publication: The Astrophysical Journal Pub Date: June 1982 DOI: 10.1086/160018 Bibcode: 1982ApJ...257..620M Keywords: Carbon Monoxide; Interstellar Matter; Molecular Clouds; Nebulae; Star Formation; Stellar Interiors; Stellar Structure; Gas Density; Gravitational Effects; Near Infrared Radiation; Star Distribution; Stellar Mass Ejection; Stellar Models; Stellar Occultation; Astrophysics full text sources ADS | data products SIMBAD (15)