SIMBAD references

1996A&A...315L.377B - Astronomy and Astrophysics, volume 315L377-380 (1996/11-2)

Solid methane toward deeply embedded protostars.

BOOGERT A.C.A., SCHUTTE W.A., TIELENS A.G.G.M., WHITTET D.C.B., HELMICH F.P., EHRENFREUND P., WESSELIUS P.R., DE GRAAUW T. and PRUSTI T.

Abstract (from CDS):

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 ν4 (`deformation') mode of solid state CH4 embedded in polar molecules (i.e., H2O and/or CH3OH) in icy grain mantles. The solid CH4 column density relative to solid H2O is 0.4-1.9%. Unlike solid CO, solid CH4 does not seem to be subjected to out-gassing toward the warm source W 33A. The low gas-to-solid ratio for CH4 argues that CH4 is formed on grains either by hydrogenation of accreted C or by ultraviolet processing of CH3OH-rich ices.

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - ISM: molecules - ISM: abundances - infrared: ISM: lines and bands - stars: individual: NGC 7538 IRS9 ([WBN74] NGC 7538 IRS 9) - stars: individual: W 33a

Simbad objects: 2

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