Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.320..131b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 320, Issue 1, pp. 131-138.
Astronomy and Astrophysics
Astronomy
7
Circumstellar Matter, Stars: Formation, Stars: Pre-Main-Sequence, Dust, Extinction, Infrared: Stars
Scientific paper
Dust emission in the non-photospheric 10-μm continua of HL Tau and Taurus-Elias 7 (Haro6-10, GV Tau) is distinguished from foreground silicate absorption using a simple disc model with radial power-law temperature and mass-density distributions based on the IR-submm model of T Tauri stars by Adams, Lada & Shu with foreground extinction. The resulting 10-μm absorption profiles are remarkably similar to those of the field star Taurus-Elias 16 obtained by Bowey, Adamson & Whittet. The fitted temperature indices are 0.44 (HL Tau) and 0.33 (Elias 7) in agreement with Boss's theoretical models of the 200-300K region, but lower than those of IR-submm discs (0.5-0.61 Mannings & Emerson); a significant fraction of the modelled 10-μm emission of HL Tau is optically thin, whilst that of Elias 7 is optically thick. We suggest that HL Tau's optically thin component arises from silicate dust within low-density layers above an optically thick disc.
Adamson Andrew J.
Bowey Janet E.
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