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An Ultraviolet Imaging Telescope study of the globular cluster M79 (NGC 1904)The Ultraviolet Imaging Telescope detects about 100 blue and extremely blue horizontal-branch (HB) stars in M79. Comparison of the ultraviolet color-magnitude diagram of M79 with stellar interior models shows that the distribution of total masses of the detected stars along with the zero-age HB includes the range of 0.495-0.62 solar mass, corresponding to envelope masses 0.01-0.13 solar mass. The total number of HB stars in M79 is estimated at 220 +/- 10. Also detected are two hot stars brighter than the horizontal branch by at least 1.5 mag at 1520 A. One of these stars (UIT 1) appears to be descending in luminosity along a pre-white dwarf track. The other (UIT 2) is most likely a post-HB star evolving toward the asymptotic giant branch.
Document ID
19930028536
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/186478
Authors
Hill, Robert S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hill, Jesse K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Landsman, Wayne B. (Hughes STX Corp. Greenbelt, MD, United States)
Bohlin, Ralph C. (Space Telescope Science Inst. Baltimore, MD, United States)
Cheng, Kwang P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hintzen, Paul M. N. (NASA Goddard Space Flight Center Greenbelt, MD; Nevada Univ., Las Vegas, United States)
O'Connell, Robert W. (Virginia Univ. Charlottesville, United States)
Roberts, Morton S. (National Radio Astronomy Observatory Charlottesville, VA, United States)
Smith, Andrew M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, Eric P. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
August 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 395
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Report/Patent Number
ISSN: 0004-637X
Accession Number
93A12533
Funding Number(s)
CONTRACT_GRANT: NAG5-700
CONTRACT_GRANT: NAGW-2596
Distribution Limits
Public
Copyright
Other

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