Strömgren uvby-beta photometry towards the region of the Cometary Globules CG 30/31/38 mgren uvby-beta photometry towards the region of the Cometary Globules CG 30/31/38

Details Strömgren uvby-beta photometry towards the region of the Cometary Globules CG 30/31/38 mgren uvby-beta photometry towards the region of the Cometary Globules CG 30/31/38 Strömgren uvby-beta photometry towards the region of the Cometary Globules CG 30/31/38 mgren uvby-beta photometry towards the region of the Cometary Globules CG 30/31/38

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358.1077n&link_type=abstract

Astronomy and Astrophysics, v.358, p.1077-1089 (2000)

Astronomy and Astrophysics

Astrophysics

8

Ism: Clouds, Ism: Dust, Extinction

Scientific paper

With the Danish 1.54 m telescope at La Silla, Chile, we have obtained deep (V~19m) CCD frames in the uvby-beta 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 uvby-beta 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 (r-E(b-y)) indicates that the minimum total absorption through half the Galactic disk along the line of sight is AV~1\fm3 in this direction. The distance to the CG 30/31/38 complex is not directly derived from the r-E(b-y)-diagram but two faint foreground M-dwarfs are identified, and based on the obtained V,(V-I) photometry a lower distance limit of 215+/-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 b ~ -1.6degr . Based on observations ESO, La Silla.

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