Magnitudes and colors of variables in the globular cluster NGC 5897

Details Magnitudes and colors of variables in the globular cluster NGC 5897 Magnitudes and colors of variables in the globular cluster NGC 5897

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..250w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 250-260. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

16

Globular Clusters, Light Curve, Lyra Constellation, Stellar Color, Stellar Magnitude, Variable Stars, Astronomical Catalogs, Color-Magnitude Diagram, Galactic Nuclei, Photographic Plates

Scientific paper

Magnitudes for the seven RR Lyr variables and one red variable in NGC 5897 have been derived from 213 B plates taken from 1939 through 1987 and from 38 V plates taken from 1956 through 1987. Blue light curves have been constructed for all the periodic variables and visual light curves for all but one star (V4) with a badly blended image. The period distribution of the RR Lyr stars is rather unusual, with three periods from 0.797 to 0.856 day, two at 0.420 and 0.454 day, and two more at 0.342 and 0.349 day. No variation to within + or - 0.1 mag can be seen for SK 120, a star which appears to be a cluster member lying within the instability strip.

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