Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1097k&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1097-1108
Astronomy and Astrophysics
Astronomy
8
Ism: Clouds, Ism: Dust, Extinction, Ism: Individual (L688, L694, L700), Ism: Molecules, Stars: Emission Line, Stars: Formation
Scientific paper
We present the results of optical and radio molecular observations of the small dark clouds L 688, L 694, and L 700 (CB 200). Based on star counts, we found a distance of 230 +/- 30 pc for the clouds. We present extinction maps of the clouds based on the USNO Catalog data. Our objective prism search for candidate pre-main-sequence stars resulted in the detection of an Hα emission star in the cloud area. We observed the clouds in the 12CO (1--0), 13CO (1--0), and C18O (1--0) lines. A ring-shaped cloud of ~ 430 Msolar was detected from the 12CO observation. Five 13CO cores were identified. Three C18O cores with N(H2) ~ (5.3--7.6) × 1021cm-2 reside in two of the 13CO cores in the northern part of the cloud. The density gradient seen in optical, infrared and radio, and also the positions of the star-formation sites may suggest the possibility of shock compression due to some stars or SNRs near the galactic plane.
Domsa Istvan
Fukui Yasuo
Kawamura Akiko
Kun Maria
Mizuno Akira
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