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HL Tauri and its circumstellar diskNew far infrared observations of HL Tau which support the identification of an edge-on disk surrounding the star are presented. A bolometric luminosity for the star of 7.2 solar luminosities and a ratio of infrared to optical luminosity of 630 are indicated. A circumstellar A(V) of about 7.0 mag is produced, consistent with the silicate optical depth to the star. Data on HL Tau's effective temperature and radius and its position on the HR diagram suggest that the star has recently completed its accretion phase and is only 100,000 yr old. The column masses of ice and silicates are combined with the disk dimensions to build a simple model of the disk for comparison with the primitive solar nebula. Estimates of the far-infrared emitting mass provide independent probes of the mass in larger grains around HL Tau.
Document ID
19830060434
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cohen, M.
(NASA Ames Research Center Moffett Field; California, University, Berkeley, CA, United States)
Date Acquired
August 11, 2013
Publication Date
July 15, 1983
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 270
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
83A41652
Funding Number(s)
CONTRACT_GRANT: NCC2-142
Distribution Limits
Public
Copyright
Other

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