Evidence for Protostellar Collapse in B335

Details Evidence for Protostellar Collapse in B335 Evidence for Protostellar Collapse in B335

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4316z&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #43.16; Bulletin of the American Astronomical Society, Vol. 24, p.799

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed five rotational transitions of H_2CO and CS toward the Bok globule, B335, with high spatial and spectral resolution. The characteristic shape of the observed profiles provides direct, kinematic evidence for collapse. In addition, we have modeled line profiles of collapsing dense cores with density and velocity structures taken from the theory of Shu and coworkers. Using the age of collapse as the only free parameter, we found that the strengths and profiles of the observed lines can be well fitted by the theoretical model. Our best-fit model gives an age of 1.5*E(5) yr, corresponding to an infall radius of 0.04 pc (30'') and a total mass of 0.4 M_sun for the central star and disk. Outside the infall radius, there is a static envelope with a r(-2) density distribution, an average temperature of 13 K, and a turbulent velocity (1/e width) of 0.12 km s(-1) . The CS abundance is 3.6*E(-9) with about 30 Assuming a stellar radius of less than 6 R_sun, we find that the luminosity of B335 ( ~ 3 M_sun) can be powered by the gravitational energy. Hence, B335 appears to be the best candidate for the Holy Grail--a true protostar--defined by Wynn-Williams.

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