Astronomy and Astrophysics, volume 360, 683-698 (2000/8-2)
Infrared observations of hot gas and cold ice toward the low mass protostar Elias 29.
BOOGERT A.C.A., TIELENS A.G.G.M., CECCARELLI C., BOONMAN A.M.S., VAN DISHOECK E.F., KEANE J.V., WHITTET D.C.B. and DE GRAAUW T.
Abstract (from CDS):
We have obtained the full 1-200µm spectrum of the low luminosity (36L☉
) Class I protostar Elias 29
in the ρ Ophiuchi molecular cloud. It provides a unique opportunity to study the origin and evolution of interstellar ice and the interrelationship of interstellar ice and hot core gases around low mass protostars. We see abundant hot CO and H2
O gas, as well as the absorption bands of CO, CO2
O and ``6.85µm'' ices. We compare the abundances and physical conditions of the gas and ices toward Elias 29
with the conditions around several well studied luminous, high mass protostars. The high gas temperature and gas/solid ratios resemble those of relatively evolved high mass objects (e.g. GL 2591). However, none of the ice band profiles shows evidence for significant thermal processing, and in this respect Elias 29
resembles the least evolved luminous protostars, such as NGC 7538 : IRS9
. Thus we conclude that the heating of the envelope of the low mass object Elias 29
is qualitatively different from that of high mass protostars. This is possibly related to a different density gradient of the envelope or shielding of the ices in a circumstellar disk. This result is important for our understanding of the evolution of interstellar ices, and their relation to cometary ices.
stars: formation - stars: individual: Elias 29 - ISM: dust, extinction - ISM: molecules - ISM: abundances - infrared: ISM: lines and bands
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