Near and Mid-Infrared Images of the Massive Star-Forming Complex G 9.62 + 0.19
2003; National Autonomous University of Mexico; Volume: 15; Linguagem: Inglês
ISSN
0185-1101
AutoresM. Tapia, P. Persi, M. Roth, Anna Marenzi, L. Testi, L. Vanzi,
Tópico(s)Astro and Planetary Science
ResumoA near- and mid-infrared study of the starformation complex G 9.62+0.19 is presented. It includes photometrically calibrated images through wide-band JHK and narrow-band Br , H2, and 12.5 m lters. The observations were made at Las Campanas, La Silla and the Observatorio Astron omico Nacional{ San Pedro M artir observatories. We found evidence of two embedded young clusters of O{B5 stars associated with the radio components B and C, the latter a compact and an ultracompact H II region. Evidence is presented of a third, more dispersed cluster of more luminous infrared stars located at the southern edge of the cloud complex. A large fraction of the stellar members of each cluster exhibit signican t infrared excess. We conrm the detection of a very red (H K = 5:2) near-infrared source immersed in the molecular hot core (component F) and report the presence of a mid-infrared counterpart (see Figures 1 and 2). The derived IR luminosity suggests that the embedded young star is of a spectral type B3. An H2 shocked gas knot, probably an obscured Herbig-Haro object, was found associated with the blue-shifted lobe of the high-velocity molecular outo w originating deep in this core. No IR sources were found at the position of the radio components D and E. These observations support the idea that the several components of the G 9.62+0.19 complex appear to be at dieren t evolutionary stages. The full details of this work will appear in a forthcoming paper.
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