A near-infrared survey of the entire R Corona Australis cloud

Details A near-infrared survey of the entire R Corona Australis cloud A near-infrared survey of the entire R Corona Australis cloud

2008-07-16

arxiv.org/abs/0807.2594v1

Astronomy and Astrophysics

Astrophysics

11 pages, 12 Figures, accepted by Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:200809949

To understand low- to intermediate-mass star-formation in the nearby R CrA molecular cloud, we try to identify the stellar content that is accessible with near-infrared observations. We obtained a JHK band mosaic of 10 x 60 arcmin square covering the entire RCrA molecular cloud with unprecedented sensitivity. We present a catalogue of about 3500 near-infrared sources fainter than the saturation limit K = 10 mag, reaching K = 18mag. We analysed the extended sources by inspecting their morphology and point sources by means of colour-colour and colour-magnitude diagrams. Additionally, we compared the extinction inferred from the NIR data with the line-of-sight dust emission at 1.2 mm. Sources towards high dust emission but relatively low H-K show a projected mm-exces; these sources are either immediately surrounded by cold circumstellar material or, if too red to be a true foreground object, they are embedded in the front layer of the 1.2 mm emitting dust cloud. In both cases they are most likely associated with the cloud.

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