Solid methane toward deeply embedded protostars.

Details Solid methane toward deeply embedded protostars. Solid methane toward deeply embedded protostars.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.377b&link_type=abstract

Astronomy and Astrophysics, v.315, p.L377-L380

Astronomy and Astrophysics

Astrophysics

79

Ism: Dust, Extinction, Ism: Molecules, Ism: Abundances, Infrared: Ism: Lines And Bands, Stars: Individual: Ngc 7538 Irs9, Stars: Individual: W 33A

Scientific paper

We report on the detection of an absorption feature near 7.67μ m toward the deeply embedded protostellar objects W 33A and NGC 7538 : IRS9. Comparison with laboratory spectra shows that this feature can be identified as the ν_4_ (`deformation') mode of solid state CH_4_ embedded in polar molecules (i.e., H_2_O and/or CH_3_OH) in icy grain mantles. The solid CH_4_ column density relative to solid H_2_O is 0.4-1.9%. Unlike solid CO, solid CH_4_ does not seem to be subjected to out-gassing toward the warm source W 33A. The low gas-to-solid ratio for CH_4_ argues that CH_4_ is formed on grains either by hydrogenation of accreted C or by ultraviolet processing of CH_3_OH-rich ices.

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