Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..256h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, April 1983, p. 256-263.
Astronomy and Astrophysics
Astronomy
48
Globular Clusters, Hertzsprung-Russell Diagram, Radial Velocity, Stellar Spectra, Ultraviolet Spectra, Variable Stars, Stellar Color, Stellar Magnitude
Scientific paper
Radial velocities of 46 stars in the fields of the globular clusters M 12 (C 1644-018) and M56 (C 1914+300) show that 23 of the stars are cluster members. When these new measurements are combined with all previous ones, the improved cluster velocities are -41.3 ± 1.5 and -134.0 ± 2.7 km s-1, respectively. Six of the observed stars are cluster UV-bright stars. A color-magnitude diagram is constructed for all known UV-bright stars in 29 globular clusters. This composite diagram suggests that UV-bright stars are present in sufficient numbers that they will contribute appreciably to the integrated ultraviolet light of old, metal-poor stellar populations. Although our figure is an improvement over earlier diagrams, it is still seriously incomplete due to selection effects.
Harris Hugh C.
Hesser James Edward
Nemec James M.
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