10 micron spectra of protostars and the solid methanol abundance

Details 10 micron spectra of protostars and the solid methanol abundance 10 micron spectra of protostars and the solid methanol abundance

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..523s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. 523-529.

Astronomy and Astrophysics

Astrophysics

25

Abundance, Infrared Spectra, Interstellar Matter, Methyl Alcohol, Protostars, Absorption Spectra, Astronomical Spectroscopy, Cosmic Dust, Ice, Pre-Main Sequence Stars

Scientific paper

A search has been made for the strong C-O stretching absorption of solid methanol near 9.8 microns toward the heavily obscured protostars AFGL 961, AFGL 2591, the BN object and Mon R2 IRS 3. There is no clear evidence for this feature in the spectra, resulting in very conservative upper limits to the methanol abundance of 6 percent to 17 percent relative to solid H2O toward these objects. This is well below previous estimates of 50-80 percent obtained toward W33 A, NGC 7538 IRS 9, AFGL 2136, and W3 IRS 5, which were based on the assignment of the interstellar 6.85 microns absorption feature to the methanol C-H bending mode. This study shows that such high methanol abundances are not a characteristic of all interstellar ices.

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