The Chemical Age of the Bok Globule CB238

Details The Chemical Age of the Bok Globule CB238 The Chemical Age of the Bok Globule CB238

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....142...70s&link_type=abstract

The Astronomical Journal, Volume 142, Issue 3, article id. 70 (2011).

Astronomy and Astrophysics

Astronomy

Ism: Clouds, Ism: Individual Objects: Cb238, Ism: Molecules

Scientific paper

The Bok globule CB238 has been investigated in 13CO (220.4 GHz), C18O (109.7 GHz), CS (97.9 and 146.7 GHz), and SO (99.3 GHz) lines, and mapped with half-power beamwidths of 11'', 22'', 38'', 16'', and 36'', respectively. The two dense cores previously found in NH3 are presently confirmed in CS. The cores exhibit similar physical and chemical characteristics. The lack of outflows, the limited chemical content, and the very modest depletion in the ammonia cores provide evidence that CB238 is not an evolved object. Molecular abundances and density ratios constrain chemical modeling whose results provide a chemical age close to the free-fall timescale.

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