Near-infrared imaging of RAFGL7009S

Annie Zavagno (1) , L. Deharveng (1) , D. Nadeau (2) , J. Caplan (1)

1 LAM - Laboratoire d'Astrophysique de Marseille
2 Observatoire du Mont Mégantic et Département de Physique, Université de Montréal

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  region G25.65+1.05, which may be excited by a B1V star. We have obtained JHK images of a 1 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 (A V ≥ 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 µm H 2 O ice absorption (Ishii et al. 2002). We estimate the YSO's age to be 2×10 4 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.

Mots clés: stars; formation -stars; pre-main sequence -stars; imaging -stars; individual; RAFGL7009S

Domaines: Planète et Univers [physics]

Annie Zavagno, L. Deharveng, D. Nadeau, J. Caplan. Near-infrared imaging of RAFGL7009S. Astronomy and Astrophysics - A&A, 2002, 394 (1), pp.225-229. ⟨10.1051/0004-6361:20021129⟩. ⟨hal-02522420⟩