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Astron. Astrophys. 362, 1138-1142 (2000)


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Distance and absorption features in the CG 30/CG 31/CG 38 complex *

J. Knude and A.S. Nielsen

Niels Bohr Institute for Astronomy, Geophysics and Physics, Juliane Maries Vej 30, 2100 Kobenhavn O, Denmark (indus@astro.ku.dk)

Received 28 April 2000 / Accepted 14 August 2000

Abstract

We report a possible confirmation of the short 200 pc distance to the cometary globules CG 30/31/38 suggested by a previously discussed (V - I) - V diagram to Vlim [FORMULA] 20 mag. New 2 magnitudes deeper V and I photometry centered on CG 31A indicate the presence of visual extinction AV = [FORMULA] at 200 pc. In addition, we may have measured an absorption gradient along the tail of CG 31C with AV varying between [FORMULA] and [FORMULA]. The Hipparcos - Tycho-2 sample of double stars is used to demonstrate that the bright - red confinements in the colour-magnitude diagram, which we use to estimate the distance and absorption of nearby molecular clouds, probably can not be caused by duplicity.

Key words: stars: formation – stars: individual: CG 30/CG 31 – ISM: clouds – ISM: dust, extinction

* Based on observations ESO, La Silla

Send offprint requests to: J.K. Knude

© European Southern Observatory (ESO) 2000

Online publication: October 30, 2000

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