Investigation of the red variable stars of M13

Details Investigation of the red variable stars of M13 Investigation of the red variable stars of M13

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..395o&link_type=abstract

Astronomical Journal, vol. 82, June 1977, p. 395-402.

Astronomy and Astrophysics

Astronomy

11

Astronomical Photography, Globular Clusters, Variable Stars, Astronomical Catalogs, Colorimetry, Giant Stars, Light Curve, Semiregular Variable Stars

Scientific paper

Photographic B photometry is presented for the variable stars V2, V10, V11, and V15 in M13 as well as for two suspected red variables of the cluster, Ludendorff numbers L 414 and L 973. Light curves and mean colors for the stars are presented. V11, V15, and L 973 are shown to be semiregular variables with periods of 92.42, 39.23, and 39.14 days, and B amplitudes of 0.5, 0.15, and 0.4 mag, respectively. Variability could not be confirmed for V10 and L 414. The results indicate that most probably all red giants in M13 redder than (B-V)=1.45 are variables.

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