Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124.3379p&link_type=abstract
The Astronomical Journal, Volume 124, Issue 6, pp. 3379-3386.
Astronomy and Astrophysics
Astronomy
1
Stars: Emission-Line, Be, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We present the results of optical and near-IR spectra and mid-infrared images of the star forming region Gy 2-18, which is associated with IRAS 05439+3035. Within this region, there is a star with strong Hα emission that is illuminating an optical reflection nebula. Optical and near-IR spectra indicate that this star, named IRS 11, is a possible Herbig Be star of spectral type BO-B2, with a strong stellar wind and an infrared excess probably originating in a circumstellar dust disk. The mid-infrared images at 8.7, 9.7, and 12.5 μm show the presence of a second very red source, IRS 9, deeply embedded in the cloud and with a remarkably strong silicate feature in absorption. The estimated bolometric luminosity of 8.6×103 Lsolar and the infrared spectral index αIR=1.9 suggest that IRS 9 is a massive protostellar object. These two sources form the core of the young stellar cluster associated with Gy 2-18. The infrared luminosity and spectral index of another member, IRS 13, are estimated to be <=165 Lsolar and <=0.44.
Bohigas Joaquin
Persi Paolo
Polcaro Vito Francesco
Tapia Mauricio
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