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Low-mass star formation in bright rimmed clouds

Published online by Cambridge University Press:  01 March 2007

V. Migenes
Affiliation:
Department of Astronomy, University of Guanajuato, P.O. Box 144, Guanajuato, GTO. Mexico 36000 email: vmigenes@astro.ugto.mx, trinidad@astro.ugto.mx
M. A. Trinidad
Affiliation:
Department of Astronomy, University of Guanajuato, P.O. Box 144, Guanajuato, GTO. Mexico 36000 email: vmigenes@astro.ugto.mx, trinidad@astro.ugto.mx
R. Valdettaro
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, Firenze, Italy 50125 email: rv@arcetri.astro.it, email: palla@arcetri.astro.it
F. Palla
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, Firenze, Italy 50125 email: rv@arcetri.astro.it, email: palla@arcetri.astro.it
J. Brand
Affiliation:
Istituto di Radioastronomia, Via Gobetti 101, Bologna, Italy I-40129 email: brand@ira.cnr.it
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Abstract

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Bright Rimmed Clouds (BRCs) are clouds that have been compressed by an external ionization-shock front which focuses the neutral gas into compact globules. The boundary layer between the neutral gas and the gas ionized by the incident photons is often called “bright rim” but the clumps are sometimes classified also as speck globules or cometary globules depending on their appearance. Small globules with bright rims have been considered to be potential sites of star formation and have been studied in several individual regions. We present the first high resolution VLA observations of 20 of these BRCs, but only three detections were obtained. The low detection rate seems to support the idea that BRCs produce mostly low-luminosity objects, for which maser emission is weak and episodic, and that the embedded sources are in a more advanced evolutionary phase than class 0 objects.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Duvert, G. et al. , 1990, A&A 233, 190Google Scholar
Froebrich, D. et al. , 2005, A&A 432, 575Google Scholar
Migenes, V. et al. , 1999, ApJS 123, 487CrossRefGoogle Scholar
Slysh, V. I. et al. , 1999, ApJ 526, 238CrossRefGoogle Scholar
Sugitani, K., Fukui, Y. & Ogura, K., 1991, ApJS 77, 59CrossRefGoogle Scholar
Sugitani, K. et al. , 2000, AJ 119, 323CrossRefGoogle Scholar
Valdettaro, R. et al. , 2005, A&A 443, 535Google Scholar
Schwartz, R. D., Wilking, B. A., & Giulbudagian, A. L., 1991, ApJ 370, 262CrossRefGoogle Scholar
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