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

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

2005-04-27

arxiv.org/abs/astro-ph/0504603v1

Astronomy and Astrophysics

Astrophysics

18 pages, 13 eps images, uses aalongtable.sty, accepted by A&A in April, in press

Scientific paper

10.1051/0004-6361:20052722

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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