Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...342l..32d&link_type=abstract
Astronomy and Astrophysics, v.342, p.L32-L35 (1999)
Astronomy and Astrophysics
Astrophysics
116
Ism: Abundances, Ism: Dust, Extinction, Ism: H Ii Regions, Ism: Individual Objects:, Infrared: Ism: Continuum, Infrared: Ism: Lines And Bands
Scientific paper
We present ground-based L-band spectra of the high-mass protostars RAFGL7009S and W 33A. Absorption bands at 3.54, 3.84 and 3.94 mu m arise in both lines of sight. We attribute these bands to the methanol nu_3 CH_3 symmetric stretch and combination modes. The CH_3OH abundance relative to water ice is about 30% for RAFGL7009S and 5-22% for W 33A, making CH_3OH the most abundant solid state molecule after H_2O toward these two sources. The profiles of the absorption features toward these objects are very similar, showing that the methanol is located in similar ice environments. Detailed spectral comparison with laboratory data implies that the methanol is not mixed uniformly with the water ice. The similarities in the spectra of these two protostars are discussed within the context of chemical differences along other lines of sight. Methanol appears to be more efficiently produced on grain mantles in the vicinity of high-mass protostars than in other locations. Based on observations with the United Kingdom Infrared Telescope, operated by the Joint Astronomy Centre on behalf of the U.K. Particle Physics and Astronomy Research Council
d'Hendecourt Louis
Dartois Emmanuel
Demyk Karine
Ehrenfreund Pascale
Geballe Thomas Ronald
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