New color-magnitude data for twelve globular clusters

Details New color-magnitude data for twelve globular clusters New color-magnitude data for twelve globular clusters

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apjs...29..397h&link_type=abstract

Astrophysical Journal Supplement Series (Supplement no. 292), vol. 29, Oct. 1975, p. 397-429. Research supported by the Nationa

Astronomy and Astrophysics

Astrophysics

145

Astronomical Catalogs, Astronomical Photography, Electrophotometers, Globular Clusters, Stellar Luminosity, Galactic Evolution, Reference Stars, Stellar Envelopes, Stellar Evolution, Tables (Data), Ubv Spectra, Ultraviolet Spectra, Variable Stars, Visual Photometry

Scientific paper

This paper presents results of a program of BV photoelectric and photographic photometry of southern globular clusters. New color-magnitude diagrams are presented for 11 clusters (NGC 2808, 4590, 5694, 5824, 6325, 6517, 6681, 6715, 6809, 6864, and 7089); for one additional cluster (NGC 6266), measurements of the variable stars are listed. The features of the diagrams are discussed briefly and used to derive basic information about the clusters, such as their distances, reddening, and characteristics of the giant and horizontal branches. More extensive discussions are presented for four particularly interesting clusters (NGC 2808, 5694, 6864, and 7089). The first of these (NGC 2808) shows a unique HB morphology, and the third (NGC 6864) is a moderately metal-rich object with an unusually large population of HB stars relative to the giant-branch stars. The second object, NGC 5694, has long been known as a possible 'intergalactic' cluster that may be escaping from the Galaxy. The information here indicates that NGC 5694 may be gravitationally bound to the Galaxy if the galactic halo within about 25 kpc is slightly more massive than in conventional models. NGC 7089 (M2) is shown to have characteristics that modify earlier conclusions from Arp's classical photographic and photoelectric photometry.

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