Variable stars in NGC 6397

Details Variable stars in NGC 6397 Variable stars in NGC 6397

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..94..253e&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 94, no. 2, Aug. 1983, p. 253-272.

Astronomy and Astrophysics

Astrophysics

2

Astronomical Photography, Globular Clusters, Stellar Color, Stellar Magnitude, Variable Stars, Astronomical Maps, Color-Magnitude Diagram, Image Processing, Photographic Measurement, Photointerpretation, Stellar Spectrophotometry

Scientific paper

Thirty-four deep sky plates of the globular cluster NGC 6397 were examined in order to check parameters of three known variables in the cluster and to discover new and generally fainter main sequence variables. The positions of the known variables in the color-magnitude diagram are shown along with magnitude and light variations of the variables. The visual and automated techniques used in the search for new variables, including COSMOS methods, are described in some detail. At least two new stellar objects, the inherent variability of which can be reported with some confidence have been found; one of these was previously reported. This star is discussed in some detail, and it is concluded that it is probably another RR Lyr-type star at a great distance behind the cluster field. The possibility that it is a W UMa variable cannot be ruled out, however.

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