Star Formation In DC274.2-0.4: Exciting Or Not?

Details Star Formation In DC274.2-0.4: Exciting Or Not? Star Formation In DC274.2-0.4: Exciting Or Not?

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734031h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #340.31; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Mid-infrared observations, obtained by the Cores-to-Disks Spitzer Legacy team, revealed several protostars and young stellar objects in the core DC274.2-0.4. With evidence for a nearby distance (130-200 pc), one of these sources qualifies as a Very Low Luminosity Object (VeLLO) and appears to be among the lowest luminosity embedded sources known, with an internal luminosity of 0.01-0.03 Lsun. If this source is indeed a VeLLO, then its discovery is exciting as it may represent the earliest stage protostar or proto-brown dwarf yet detected. However, the internal luminosity critically depends on the distance and some evidence suggests that DC274.2-0.4 is more distant (>400 pc), making this core a more typical site of low-mass star formation. We review the different distance determinations, and present new optical spectra obtained with Magellan/IMACS to help settle the ambiguity. Finally, we discuss the star-forming environment of DC274.2-0.4 in light of additional infrared observations from CTIO/ISPI, Magellan/MMIRS, and HST/WFC3.

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