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Pre-main-sequence disk accretion in Z Canis MajorisIt is suggested that the pre-main-sequence object Z CMa is a luminous accretion disk, similar in many respects to the FU Orionis variables. Z CMa shows the broad, doubled optical absorption lines expected from a rapidly rotating accretion disk. The first overtone CO absorption detected in Z CMa is blue-shifted, suggesting line formation in a disk wind. Accretion at rates about 0.001 solar mass/yr over 100 yr is required to explain the luminosity of Z CMa. The large amount of material accreted (0.1 solar mass/yr) indicates that Z CMa is in a very early stage of stellar evolution, possibly in an initial phase of massive disk accretion.
Document ID
19890043812
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/167252
Authors
Hartmann, L. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Kenyon, S. J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Hewett, R. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Edwards, S. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Strom, K. M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Strom, S. E. (Massachusetts, University Amherst, United States)
Stauffer, J. R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 14, 2013
Publication Date
March 15, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 338
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A31183
Distribution Limits
Public
Copyright
Other

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