Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...394..225z&link_type=abstract
Astronomy and Astrophysics, v.394, p.225-229 (2002)
Astronomy and Astrophysics
Astrophysics
5
Stars: Formation, Stars: Pre-Main Sequence, Stars: Imaging, Stars: Individual: Rafgl7009S
Scientific paper
RAFGL7009S is a deeply embedded massive young stellar objet (YSO) showing strong ice and saturated silicate absorption features in the mid infrared. It is associated with the ultracompact H II region G25.65+1.05, which may be excited by a B1V star. We have obtained JHK images of a 1arcmin field centred on this YSO. In K we detect a non-resolved object coinciding with the radio continuum emission peak. Considering the high extinction towards this source (AV >= 100 mag), the observed K emission is more than 7 mag in excess of that expected for a B1V star. We suggest that this emission is mainly due to scattering of the central zone emission, as recently found for a sample of embedded massive YSOs associated with 3.1 mu m H2O ice absorption (Ishii et al. \cite{ish02}). We estimate the YSO's age to be 2x104 years. The outflow, the methanol maser emission and the strong ice absorption features suggest the presence of a dense medium very close to the star, possibly a disk. Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130 . 79 . 128 . 5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/394/225
Caplan James
Deharveng Lise
Nadeau Daniel
Zavagno Annie
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