BV photometry of RR Lyrae variables in the globular cluster M92

Details BV photometry of RR Lyrae variables in the globular cluster M92 BV photometry of RR Lyrae variables in the globular cluster M92

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104...44c&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, Jan. 1992, p. 44-56. Research supported by Danish

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44

Globular Clusters, Light Curve, Variable Stars, Visual Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Computational Astrophysics, Lyra Constellation

Scientific paper

BV CCD photometry is presented for seven RR Lyrae variables in the globular cluster M92 (NGC 6341). New ephemerides are computed, and V, B, and B-V light curves are given. A color-magnitude diagram based on two V and two B short exposures is given, reaching from above the horizontal branch to below the main sequence turn-off. A comparison with results from other workers shows agreement with the photometry of Cathey, and Stetson and Harris. The timing of the secondary bumps in the light curves of five of the RRab variables is studied and found to be consistent with prediction from the echo model. Expansion radii derived from radial velocities are not consistent with the photospheric infall model of the secondary bump.

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