L-band (3.5 micron) IR-excess in massive star formation, I. 30 Doradus

L-band data of 30 Doradus at 3.5 micron taken with SPIREX (South Pole Infrared Explorer) is presented. The photometry was combined with 2MASS JHK data at 1.25-2.2 micron. Colour-colour and colour-magnitude diagrams are constructed and used to determine the sources with infrared excess. These are int...

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Bibliographic Details
Main Authors: Maercker, M, Burton, M G
Language:English
Published: 2005
Subjects:
Astrophysics and Astronomy
South Pole
South pole
Online Access:http://cds.cern.ch/record/847510
Description
Summary:L-band data of 30 Doradus at 3.5 micron taken with SPIREX (South Pole Infrared Explorer) is presented. The photometry was combined with 2MASS JHK data at 1.25-2.2 micron. Colour-colour and colour-magnitude diagrams are constructed and used to determine the sources with infrared excess. These are interpreted as circumstellar disks, and enable the fraction of sources with disks (the cluster disk fraction or CDF) to be determined. We find that ~42% of the sources detected at L-band in 30 Doradus have an IR-excess.

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