CCS in Bok Globules - A Possible Age Indicator?

Details CCS in Bok Globules - A Possible Age Indicator? CCS in Bok Globules - A Possible Age Indicator?

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2729m&link_type=abstract

ATNF proposal P704, Semester: October, 2009

Physics

Star Formation, Interstellar Medium In And Around The Milky Way, Parkes

Scientific paper

An important, but not completely solved question in the context of low-mass star formation is the connection between physical and chemical evolution of the small dark clouds from which protostars emerge. In the past, the NH3/CCS abundance ratio has been suggested to be a particularly useful tracer of the cloud evolution. Our earlier observations of a small sample of isolated Bok globules support this hypothesis. They show an increase of the NH3/CCS abundance ratio from less towards more evolved objects and provide evidence for a positive correlation between the colors of infrared sources embedded in the globules and the NH3/CCS ratio. We propose to search a larger sample of Bok globules in different evolutionary stages for CCS(2_1-1_0) emission. Along with the NH3 data available in the literature for all targets, we want to examine the correlation of NH3/CCS ratio and evolutionary stage in more detail and ascertain the trends found so far on a statistical representative basis.

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