Low-Mass Protostars and Protostellar Stages

Details Low-Mass Protostars and Protostellar Stages Low-Mass Protostars and Protostellar Stages

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.224...29a&link_type=abstract

Astrophysics and Space Science, Volume 224, Issue 1-2, pp. 29-42

Astronomy and Astrophysics

Astrophysics

26

Protostars, Evolution, Infall, Jets

Scientific paper

The use of sensitive receivers on large ground-based radiotelescopes such as the JCMT, the IRAM 30 m MRT, and the VLA has recently yielded significant progress in our observational understanding of low-mass protostars. Submillimeter continuum observations suggest that the youngest stellar objects detected in the near-/mid-IR range -the so-called Class I sources or “infrared protostars” - have only residual amounts of circumstellar material and are thus relatively evolved. At the same time, a smaller number of colder and more obscured YSOs - designated “Class 0” - characterized by virtually no emission below 10µm but strong submillimeter emission have been identified. These Class 0 or “submillimeter protostars” have not yet assembled the bulk of their final stellar mass, and correspond to the youngest protostar stage known to date (probable age ≲ 104 yr). Direct evidence for gravitational infall has been found in some of these sources confirming their protostellar nature. However, most (if not all) Class 0 protostars already drive highly collimated CO outflows.

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