Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26q.161m&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
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 as in Orion and M17. Some systematic surveys of bright-rimmed clouds/globules associated with IRAS point sources have been made searching for new candidates of recent star formation. For some of the 44 objects in the northern sky, evidence has been found for the presence of small clusters of embedded sources of intermediate and high-far-infrared luminosity (L_{FIR} > 10^2 Lsun). We present the first high resolution VLA observations for the three detected sources, from the 20 BRCs observed during the months of February and March 2005: IRAS 21346+5714 (BRC36), IRAS 21388+5622 (BRC37) and IRAS 21445+5712 (BRC39). 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.
Brand Jan
Migenes Victor
Palla Fabrizio
Trinidad Miguel A.
Valdettaro Riccardo
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