The young stellar cluster associated with IRAS 09149-4743
Abstract
Context: We present the results of a near-infrared survey of the young stellar cluster associated with IRAS 09149-4743, a member of the Vela Molecular Ridge.
Aims: The main purpose of this survey is to study the cluster members and find the ionizing sources of the associated HII region.
Methods: Infrared photometry of 62 stars located in the crowded parts of the cluster is given in the J, H, and K bands. Colour-colour and colour-magnitude diagrams are drawn to obtain an estimate of their spectral type and reddening.
Results: Three main sources are identified as candidates to ionize the HII region: a star located at the centre of the cluster, inside the IRAS error ellipse; a second star, member of a small "subcluster" situated 1.1' to the southeast of the former; and a third object, showing very high colour indices, which indicate visual extinction over 20 mag. Dereddened J magnitudes suggest that the former two stars probably are the main ionizing sources, whereas the latter is too reddened to allow a reliable estimate of its spectral type by photometric methods.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 2007
- DOI:
- 10.1051/0004-6361:20054507
- Bibcode:
- 2007A&A...461..949O
- Keywords:
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- stars: formation;
- ISM: HII regions;
- Galaxy: open clusters and associations: individual: IRAS 09149-4743;
- infrared: stars