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Candidate solar-type protostars in nearby molecular cloud cores
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1986
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IRAS observations were used to survey nearly 100 dense molecular clumps traced by CO and NH3 lines. The study aimed to analyze the spectral energy distributions and physical properties of sources in these cores, comparing cores with and without infrared emission and estimating their evolutionary timescales. The authors selected an IRAS sample of candidate protostars, described its properties, and examined their spectral energy distributions to classify cores and assess embeddedness. More than one‑third of the cores contain infrared sources indicative of newly forming low‑mass stars; about a third of these resemble T Tauri stars, while the rest are optically invisible, embedded near cloud peaks with cold massive envelopes, and some cores lacking infrared sources show gas conditions suggestive of imminent collapse. Published in The Astrophysical Journal (1986), DOI:10.1086/164421.
view Abstract Citations (521) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Candidate Solar-Type Protostars in Nearby Molecular Cloud Cores Beichman, C. A. ; Myers, P. C. ; Emerson, J. P. ; Harris, S. ; Mathieu, R. ; Benson, P. J. ; Jennings, R. E. Abstract IRAS data have been used to examine the vicinity of nearly 100 dense clumps of molecular gas observed in lines of CO and NH3. More than one-third of these molecular cloud 'cores' contain infrared sources that appear to be newly formed, or forming, low mass stars. While about one-third of the infrared sources are associated with visible stars and have properties that resemble T Tauri stars, the remainder of the infrared sources have no optical counterparts and are probably embedded within the molecular cloud itself. These invisible sources lie close to the molecular cloud peaks and have cold, massive shells of material around them. Some of the cores without infrared sources have gas properties similar to those with embedded sources and so may be on the verge of gravitational collapse. The selection of the IRAS sample and its properties are described. The spectral energy distributions of the sources and their nature are discussed along with their physical properties, the properties of cores with and without infrared sources, and the time scale for the evolution of the sources. Publication: The Astrophysical Journal Pub Date: August 1986 DOI: 10.1086/164421 Bibcode: 1986ApJ...307..337B Keywords: Interstellar Gas; Molecular Clouds; Protostars; Star Formation; Infrared Astronomy Satellite; T Tauri Stars; Astrophysics; INFRARED: SOURCES; INTERSTELLAR: MOLECULES; STARS: FORMATION full text sources ADS | data products SIMBAD (48)