Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..686w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Sept. 1990, p. 686-694. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
6
Astronomical Photography, Astronomical Photometry, Globular Clusters, Stellar Spectrophotometry, Variable Stars, Blue Stars, Giant Stars, Interstellar Extinction, Light Curve, Stellar Color, Stellar Magnitude
Scientific paper
Visual magnitudes have been measured for 20 variables on 32 plates of M28. These have been combined with previously published as well as newly determined blue magnitudes in order to obtain colors for the variables. Blue and visual light curves are presented for 15 of the the variables, including one W Virginis star V4, one RV Tauri star V17, one field Mira variable V7, nine cluster RR Lyrae stars, and three field RR Lyrae stars. It is shown that V14, previously thought to be a c type RR Lyrae star, is to the red of the instability strip. The visual light curve of V9 suggests that the star may be a member of a binary or a very close optical double. Possible evidence for differential reddening in the vicinity of M28 is presented. The bimodal distribution of the periods of the RR Lyrae stars in M28 may indicate a spread in metallicity among the RR Lyrae variables.
Butterworth Steven
Wehlau Amelia
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