The young stellar cluster associated with IRAS 09149-4743

Details The young stellar cluster associated with IRAS 09149-4743 The young stellar cluster associated with IRAS 09149-4743

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...461..949o&link_type=abstract

Astronomy and Astrophysics, Volume 461, Issue 3, January III 2007, pp.949-955

Astronomy and Astrophysics

Astrophysics

4

Stars: Formation, Ism: Hii Regions, Galaxy: Open Clusters And Associations: Individual: Iras 09149-4743, Infrared: Stars

Scientific paper

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.

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