Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..154..391w&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 154, Issue 1, pp. 391-395.
Astronomy and Astrophysics
Astronomy
47
Accretion, Accretion Disks, Stars: Circumstellar Matter, Infrared: Stars, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We present Spitzer Space Telescope Infrared Spectrograph observations in the 5.3-20 μm range of five young stellar objects in Taurus that have Class I continuum spectral energy distributions (λFλαλn,n>=0), often taken to represent the youngest stellar objects in this star formation region. The spectra include a rich collection of broad absorption features that we identify with amorphous silicates and various ices, notably those of carbon dioxide and water. We show that the absorption features are produced mainly in the envelopes of these systems. The apparent depths of silicate and 15.2 μm CO2 ice features vary among the objects in a manner that is consistent with a variation of inclination with respect to the line of sight, contribution to the silicate features from material throughout the envelopes, and an origin for the CO2 ice feature in the outer parts of the envelope. Thus, these features provide new and useful constraints on models of the physical structure of Class I protostars.
Barry Joseph D.
Brandl Bernhard R.
Calvet Nuria
Chen Christine H.
D'Alessio Paola
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