The stellar population and complex structure of the bright-rimmed cloud IC 1396N - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado

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Abstract: Context. IC 1396N is a bright-rimmed cloud associated with anintermediate-mass star-forming region, where a number of Herbig-Haro objects,H2 jet-like features, CO molecular outflows, and millimeter compact sourceshave been observed. Aims. To study in detail the complex structure of the IC1396N core and the molecular outflows detected in the region and to reveal thepresence of additional YSOs inside this globule. Methods. We carried out a deepsurvey of the IC 1396N region in the J, H, K- broadband filters and deephigh-angular resolution observations in the H2 narrowband filter with NICS atthe TNG telescope. The completeness limits in the 2MASS standard are Ks~17.5,H~18.5 and J~19.5. Results. A total of 736 sources have been detected in allthree bands within the area where the JHK- images overlap. There are 128sources detected only in HK-, 67 detected only in K-, and 79 detected only inH. We found only few objects exhibiting a Near-Infrared excess and no clearsigns of clustering of sources towards the southern rim. In case of triggeredstar formation in the southern rim of the globule, this could be very recent,because it is not evidenced through Near-Infrared imaging alone. The H2emission is complex and knotty and shows a large number of molecular hydrogenfeatures spread over the region, testifying a recent star-formation activitythroughout the whole globule. This emission is resolved into several chains orgroups of knots that sometimes show a jet-like morphology. The shocked cloudletmodel scenario previously proposed to explain the V-shaped morphology of the COmolecular outflow powered by the intermediate-mass YSO BIMA 2 seems to beconfirmed by the presence of H2 emission at the position of the deflectingwestern clump. New possible flows have been discovered in the globule,

Autor: M.T. Beltran 1, F. Massi 2, R. Lopez 3, J.M. Girart 4, R. Estalella 3 1 Universitat de Barcelona-CSIC 2 INAF-Osservatorio Astrofi


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