EDP Sciences
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Volume 370, Number 3, May II 2001
Page(s) 991 - 995
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010287

A&A 370, 991-995 (2001)
DOI: 10.1051/0004-6361:20010287

IRAS 18456-0223 -a flare star in a new star forming region

S. Kimeswenger1 and R. Weinberger1

1  Institut für Astrophysik der Leopold-Franzens-Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria http://astro.uibk.ac.at

(Received 11 January 2001 / Accepted 16 February 2001)

We report the discovery of a new conspicuous flare star coincident with the position of the IRAS PSC source 18456-0223 that is located in or projected on a dark cloud. In the immediate vicinity of the source, a very faint nebula and a small group of stars are detected in the optical. We carried out rough red band photometry and accurate astrometry of those stellar objects. In addition, near-infrared images were obtained with the DENIS survey instrument in I (0.8), J (1.25) and $K_{\rm s}$ (2.15 $\mu$m) that show an increasing number of stars which appear to constitute a small cluster around the position of the IRAS source; the flare star itself ( $R_{\rm MAX} \approx$ 15 55, $R_{\rm MIN} > $ 22 5) however, could not be traced. We assume that the flare star is enshrouded in a dust cloud of $A_{V}> 10^{\rm m}$. By using a K vs. J-K diagram we were able to detect a new star forming region around IRAS 18456-0223 by identifying a number of YSO candidates. The distance estimate is $1600\pm400$ pc and that of the foreground extinction $A_{V} = 2\pm0.5$ mag.

Key words: surveys -- stars: flare -- stars: formation -- ISM: clouds

Offprint request: S. Kimeswenger, Stefan.Kimeswenger@uibk.ac.at

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© ESO 2001