Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...498..716c&link_type=abstract
Astrophysical Journal v.498, p.716
Astronomy and Astrophysics
Astronomy
78
Ism: Dust, Extinction, Infrared: Ism: Lines And Bands, Ism: Molecules, Stars: Evolution, Stars: Pre-Main-Sequence
Scientific paper
We have obtained CO absorption profiles of several young stellar objects (YSOs), spanning a range of mass and luminosity, in order to investigate their ice mantle composition. We present the first detection of CO toward the class I YSO L1489 IRS in the Taurus dark cloud. In general, the CO profiles for YSOs show evidence for both processed and pristine ices in the same line of sight; strong indirect evidence for CO2 is suggested in R CrA IRS 7, L1489 IRS, Elias 18, and GL 961E. Toward other sources (R CrA IRS 1, IRS 2, W33A, NGC 7538 IRS 9, Mon R2 IRS 2) CO is present in (nearly) pure form. We propose an evolutionary scenario to explain the chemical diversity of the icy mantles toward these objects.
Adamson Andrew J.
Boogert Abraham C. A.
Chiar Jean E.
Gerakines Perry A.
Pendleton Yvonne J.
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