Probing the circumstellar environments of very young low-mass stars using water masers

Details Probing the circumstellar environments of very young low-mass stars using water masers Probing the circumstellar environments of very young low-mass stars using water masers

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..181t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. 181-190.

Astronomy and Astrophysics

Astronomy

38

Radio Sources (Astronomy), Star Formation, Stellar Envelopes, Stellar Mass Ejection, Water Masers, Infrared Astronomy Satellite, Radio Astronomy, Stellar Mass, Stellar Winds, Very Large Array (Vla)

Scientific paper

The VLA is used to search nearby very young low-mass stars for water maser emission. The sample consists of 26 low-luminosity IRAS sources embedded in dense molecular cores, a class of sources suspected to be newly forming low-mass stars on the order of a few hundred thousand years old. Three sources were detected. High spatial resolution maps show the region of maser emission is generally confined to an area smaller than about 0.5 arcsec near the star, and the velocities of individual components span intervals ranging from 20 to 40 km/s. It is inferred from the fact that the maser velocities are too large to be due to gravitational motions in at least two of the sources that the masers are associated with the winds from the young low-mass stars. A comparison of the high spatial resolution maser data to lower-resolution CO data shows no evidence for higher collimation close to the star; the stellar wind cavity appears to have similar collimation at 10 exp 15 cm as at 10 exp 7 to 10 exp 18 cm.

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