EDP Sciences
Free access
Volume 397, Number 1, January I 2003
Page(s) 227 - 236
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021480

A&A 397, 227-236 (2003)
DOI: 10.1051/0004-6361:20021480

Near and Mid-infrared images of the massive star forming complex G9.62+0.19

P. Persi1, M. Tapia2, 3, M. Roth4, A. R. Marenzi1, L. Testi5 and L. Vanzi6

1  Istituto Astrofisica Spaziale e Fisica Cosmica, CNR, Via del Fosso del Cavaliere, 00133, Roma, Italy
    e-mail: persi@rm.iasf.cnr.it
2  Instituto de Astronomía, UNAM, Apartado Postal 877, Ensenada, Baja California, CP 22833, Mexico
3  Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138, USA
4  Las Campanas Observatory, Carnegie Institution of Washington, Casilla 601, La Serena, Chile
5  Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
6  European Southern Observatory, Alonso de Cordoba 3107, Santiago, Chile

(Received 26 April 2002 / Accepted 8 October 2002 )

A near- and mid-infrared study of the star formation complex G9.62+0.19 is presented. It includes photometrically calibrated images through wide-band JHK and narrow-band Br $\gamma$, H 2 and 12.5 $~\mu \rm m$ filters. These were taken at Las Campanas, La Silla and OAN-San Pedro Mártir. We found evidence of two embedded young clusters of O-B5 stars associated with the radio components B and C, one compact and one ultracompact HII region. The data suggest the presence of a third, more dispersed cluster of more luminous infrared stars at the southern edge of the cloud complex. A large fraction of the star members of each cluster exhibit significant infrared excess. We confirm the detection of a very red near- and mid-infrared source immersed in the molecular hot core (component F). An H 2 shocked gas knot, probably an obscured Herbig-Haro object, was found associated to the blue-shifted lobe of the high-velocity molecular outflow in this core. The properties of the individual sources are discussed in detail.

Key words: stars: formation -- infrared: stars

Offprint request: P. Persi, persi@rm.iasf.cnr.it

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