Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912020t&link_type=abstract
American Astronomical Society, 189th AAS Meeting, late abstracts, #120.20; Bulletin of the American Astronomical, Vol. 29, p. 73
Astronomy and Astrophysics
Astronomy
Scientific paper
High spatial resolution images of HH-30 in the Taurus-Auriga molecular cloud seem to suggest a star plus circumstellar disk system viewed edge-on. Previous efforts to model this "disk" have allowed parameters such as disk vertical scale height, degree of flaring, and radial density gradient to be free parameters. Although these models obtained reasonable fits to the data, the end result was an extremely flared disk with a very small scale height at the stellar surface and an inner dust radius of 0.5 AU. This picture conflicts with theoretical models of Keplerian accretion disks and is unable to explain the near-IR excess emission observed from Class II T-Tauri stars. We have re-examined the HST images using Monte Carlo radiation transfer codes, and we model the system as a "standard" infalling envelope plus disk geometry with jet-carved cavities. Our model successfully reproduces HST images and colors and predicts spatially resolved polarization. Since we are able to fit the data using standard parameters, we suggest that HH-30 is a Class I embedded protostar with jet-carved bipolar cavities, and not a Class II star plus disk system.
Turnbull Margaret C.
Whitney Barbara A.
Wood Kathleen
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