Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...457..743c&link_type=abstract
Astrophysical Journal v.457, p.743
Astronomy and Astrophysics
Astronomy
5
Ism: Globules, Ism: Individual Alphanumeric: L810, Ism: Jets And Outflows, Ism: Structure, Radio Lines: Ism
Scientific paper
We have used the Haystack 37 m radio telescope to obtain high angular resolution spectral line maps of the innermost region of the star-forming Bok globule L810 (CB 205). These maps cover the central 1' x 1' region with a sampling interval of 8"-10". One map was obtained in the CO (J = 1-0) spectral line in order to identify the source(s) of the high-velocity gas. A CS (J = 2-1) map was obtained in order to find the location and kinematics of dense gas in this cloud core. Finally, a jetlike feature seen in near-infrared images was examined in two lines each of SO and SO2, to search for postshock chemical abundance enhancements.
We find a bright 4-11 Msun CS core associated with both the IRS near-infrared stellar source (identified by Yun et al. 1993) and the IRAS 19433+2743 far-infrared point source. The red and blue CO outflow lobes do appear to originate from IRS/IRAS 19433+2743 and join with the larger scale CO lobes mapped by Xie & Goldsmith (1990). However, the outflow lobes are not symmetrically placed about the IRS source. Instead, the outflow lobes are both offset some 30" westward of the IRS position, producing a "swept-back" appearance. The abundance of SO is not enhanced in the region of the jetlike feature, although CS shows a local intensity maximum there. The apparent location of the near-infrared jetlike feature, in the middle of the newly resolved blue outflow lobe, may be due to either enhanced dust scattering from a preexisting cloud clump located within the outflow or it could signify the presence of a region influenced by a previous epoch of star formation within L810.
Berkovitch Michael
Clemens Dan P.
Patel Nimesh
Xie Taoling
Yun Joao Lin
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