Ultraviolet Imaging Telescope Observations of the Horizontal Branch in M13

Details Ultraviolet Imaging Telescope Observations of the Horizontal Branch in M13 Ultraviolet Imaging Telescope Observations of the Horizontal Branch in M13

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...501l..67p&link_type=abstract

Astrophysical Journal Letters v.501, p.L67

Astronomy and Astrophysics

Astronomy

8

Galaxy: Globular Clusters: Individual Messier Number: M13, Stars: Horizontal-Branch, Ultraviolet: Stars

Scientific paper

Images of the globular cluster M13 were obtained with the Ultraviolet Imaging Telescope (UIT) during the Astro-2 Spacelab mission. A total of 488 stars are detected in the UIT B5 filter centered at 1620 A. Of an uncrowded sample of 247 stars, 232 are well correlated with ground-based Johnson V photometry, which was provided by K. Montgomery (1995, private communication). A color-magnitude diagram, constructed from the (m1620-V) color index and the m1620 magnitude, shows a well-populated, blue horizontal branch extending to a temperature in excess of 35,000 K. A King plot of radial density distribution is satisfied by an exponential of index alpha =3.0 , which is consistent with Laget et al. Recent evolutionary models by Sweigart that include the effects of helium mixing into the hydrogen envelope of horizontal-branch stars, in addition to the latest canonical models, are considered when discussing the extreme blue horizontal-branch morphology. An offset toward a higher luminosity of stars near the zero-age horizontal branch in the 4.1<{log}T_{{eff}}<4.3 region is also discussed.

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