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Astron. Astrophys. 358, 1077-1089 (2000)


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Strömgren [FORMULA] photometry towards the region of the Cometary Globules CG 30/31/38 *

A.S. Nielsen, H. Jonch-Sorensen and J. Knude

Niels Bohr Institute for Astronomy, Geophysics and Physics, Juliane Maries Vej 32, 2100 Kobenhavn O, Denmark (alan@astro.ku.dk)

Received 24 March 2000 / Accepted 26 April 2000

Abstract

With the Danish 1.54 m telescope at La Silla, Chile, we have obtained deep ([FORMULA]) CCD frames in the [FORMULA] Strömgren system towards the region of the cometary globules CG 30/31/38. Also, a nearby reference field, with a minor amount of visible molecular material, has been observed in order to estimate the expected normal foreground reddening in this direction of the Galaxy. We have obtained complete [FORMULA] information for 698 and 526 stars in these two regions, respectively, allowing a determination of individual stellar extinctions and distances for the A- to G-type star subsample meeting the criteria in the calibrations. A lower envelope in the distance-reddening diagram ([FORMULA]) indicates that the minimum total absorption through half the Galactic disk along the line of sight is [FORMULA] in this direction. The distance to the CG 30/31/38 complex is not directly derived from the [FORMULA]-diagram but two faint foreground M-dwarfs are identified, and based on the obtained [FORMULA] photometry a lower distance limit of 215[FORMULA]40 pc is derived.

We also report the discovery of a galaxy seen in V and I-band exposures in spite of the high extinction, located at the very low galactic latitude of [FORMULA].

Key words: ISM: clouds – ISM: dust, extinction

* Based on observations ESO, La Silla

© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000

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