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Astron. Astrophys. 351, 303-308 (1999)

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Determining the extinction through dark clouds

T.C. Teixeira 1,2 and J.P. Emerson 1

1 Department of Physics, Queen Mary and Westfield College, Mile End Road, London E1 4NS, England, UK (j.p.emerson@qmw.ac.uk)
2 Institute of Physics and Astronomy, Å rhus University, Ny Munkegade, 8000 Å rhus C, Denmark (tct@obs.aau.dk)

Received 28 January 1999 / Accepted 19 August 1999


We discuss the problem of a consistent determination of the visual extinction to objects in and behind a dark cloud. The use of near-infrared colours is discussed, in particular the H-K colours. We concentrate on the uncertainties, with emphasis on the extinction law and on the intrinsic colours of the young stars embedded in a dark cloud. The cases of the two intensively studied nearby star-forming clouds, Taurus and Ophiuchus, are addressed.

Key words: ISM: clouds – ISM: dust, extinction – infrared: ISM: lines and bands

Send offprint requests to: T.C. Teixeira

© European Southern Observatory (ESO) 1999

Online publication: November 2, 1999