Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..759f&link_type=abstract
Astronomy and Astrophysics, v.339, p.759-772 (1998)
Astronomy and Astrophysics
Astrophysics
29
Methods: Observational, H Ii Regions, Stars: Formation, Stars: Early-Type
Scientific paper
We present new imaging data on the ultracompact H ii region G45.45+0.06 at near- and mid-infrared wavelengths. High-resolution data were taken in the H and K' bands using ESO's adaptive optics system ADONIS. The resulting images with a generic resolution of 0.4″ for the first time allow the resolution of the object into several single point-like sources. Additionally, we present images obtained in the mid-infrared at 3.5, 10, and 12 mu m. A Br>~mma image was obtained to serve as a measure for the extinction towards this region. We derive the physical properties of the point sources and show that some of them are young, massive stars. By combining our data with earlier VLA maps, we measure the extinction towards the region and discuss the history of the object. Finally, we conclude that G45.45+0.06 is a young OB cluster similar to the KL/BN Region in Orion and that sequential star formation is the reason for its present morphology. Based on observations collected at the European Southern Observatory, La Silla, Chile. Prop. ID:55.C-0647. Based on observations collected at the DSAZ astronomical centre on Calar Alto, Spain
Feldt Markus
Hayward Thomas L.
Henning Th
Klein Ralf
Lehmann Th.
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