Identification of a collapsing protostar

Details Identification of a collapsing protostar Identification of a collapsing protostar

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212..139e&link_type=abstract

Astrophysics and Space Science, vol. 212, nos. 1-2, p. 139-145

Astronomy and Astrophysics

Astronomy

2

Infrared Sources (Astronomy), Protostars, Star Formation, Stellar Mass Accretion, Collapse, Far Infrared Radiation, Identifying, Line Spectra, Millimeter Waves, Molecular Clouds, Molecular Spectra

Scientific paper

The globular molecular cloud B335 contains a single, deeply embedded, far-infrared source. Our recent observations of H2CO and CS lines toward this source provide direct kinematic evidence for collapse. Both the intensity and detailed shape of the line profiles match those expected from inside-out collapse inside a radius of 0.036 pc. The collapse began about 1.5 X 105 years ago, similar to the onset of the outflow. The mass accretion rate is about 10 times the outflow rate, and about 0.4 solar mass should have now accumulated in the star and disk. Because B335 rotates only very slowly, any disk would still be very small (about 3 AU). The accretion luminosity should be adequate to power the observed luminosity. Consequently, we believe that B335 is indeed a collapsing protostar.

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