The Spitzer survey of interstellar clouds in the Gould Belt. III. A multi-wavelength view of Corona Australis. (2011)
Keywords :
infrared general - ISM: clouds - ISM: individual objects (Corona Australis) - ISM: jets and outflows - stars: formation - stars: pre-main sequence
Abstract:We present Spitzer Space Telescope IRAC and MIPS observations of a 0.85deg^2^ field including the Corona Australis (CrA) star-forming region. At a distance of 130pc, CrA is one of the closest regions known to be actively forming stars, particularly within its embedded association, the Coronet. Using the Spitzer data, we identify 51 young stellar objects (YSOs) in CrA which include sources in the well-studied Coronet cluster as well as sources distributed throughout the molecular cloud. Twelve of the YSOs discussed are new candidates, one of which is located in the Coronet. Known YSOs retrieved from the literature are also added to the list, and a total of 116 candidate YSOs in CrA are compiled. A clustering analysis was also performed,
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Corona Australis was observed with the Spitzer Infrared Array Camera
(IRAC) at 3.6, 4.5, 5.8, and 8.0um and the Multiband Imaging
Photometer for Spitzer (MIPS) at 24, 70, and 160um as part of two
guaranteed time observation (GTO) programs (PID 6 (2004 Apr 20), 30784
(2006 Sep 25; 2007 May 29-30); PI: Fazio) as well as the Gould Belt
Legacy Survey (PID 30574 (2008 May 10 & Oct 23); PI: Allen).
The regions around the previously identified YSOs IRS 5, IRS 7, and
IRAS 32 (IRAS 18595-3712) were observed with the SMA (Submillimeter
Array) in the dust continuum near 225GHz (~1.3mm). Observations of the
IRS 7 region were made on 2006 August 20 (program 2006-03-S046), while
IRAS 32 and IRS 5 were observed on 2008 June 10 and 14 (program
2008A-S074).
As a complement to the Spitzer and SMA data, we make use of
multi-epoch H2 (2.12um) maps to detect jets and outflows in the CrA
star-forming region to study their proper motions and identify the
exciting sources.
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