Embedded young stellar population in the galactic molecular cloud associated with IRAS 18236-1205

Details Embedded young stellar population in the galactic molecular cloud associated with IRAS 18236-1205 Embedded young stellar population in the galactic molecular cloud associated with IRAS 18236-1205

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..37..165r&link_type=abstract

A Long Walk Through Astronomy: A Celebration of Luis Carrasco's 60th Birthday (Eds. E. Recillas, A. Luna, & Y. D. Mayya) Revista

Astronomy and Astrophysics

Astronomy

1

Hii Regions, Ism: Clouds, Stars: Formation, Stars: Pre-Main Sequence

Scientific paper

We study the molecular cloud associated with the ultracompact HII region IRAS 18236-1205 to identify the young stellar objects (YSOs) embedded in the cloud. The ^{13}CO intensity contours from the Galactic Ring Survey (GRS) data were used to define the geometry of the cloud, and the search for YSOs was carried out based on the NIR 2MASS photometric data. The search yielded two objects inside the IRAS beam, both with counterparts with the recently available Spitzer sources. The NIR to FIR Spectral Energy Distributions of these two sources were modeled as the sum of fluxes of an embedded hot star and a warm dust envelope. From the resulting fits, we infer spectral types of B0.5V and B8V for the two YSOs, both experiencing visual extinctions of ˜ 20 mag, with the former source responsible for almost all the observed emission in the IRAS 60 and 100 μm bands. A third stellar object inside the IRAS beam was identified only on the Spitzer images, and is associated with an arc at 4.5 μm, which we propose as a low-mass star with an outflow.

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