An Ultraviolet Imaging Telescope study of the globular cluster M79 (NGC 1904)

Details An Ultraviolet Imaging Telescope study of the globular cluster M79 (NGC 1904) An Ultraviolet Imaging Telescope study of the globular cluster M79 (NGC 1904)

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..17h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 1, p. L17-L20.

Astronomy and Astrophysics

Astronomy

18

Globular Clusters, Ultraviolet Telescopes, Color-Magnitude Diagram, Spaceborne Astronomy, Stellar Envelopes, Stellar Interiors, Stellar Mass

Scientific paper

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.

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