BV Photometry and Radial Velocity Curves for the Pop. II Cepheid Variable V42 in M5

Session 102 - Pulsating Stars.
Display session, Thursday, January 18
North Banquet Hall, Convention Center

[102.06] BV Photometry and Radial Velocity Curves for the Pop. II Cepheid Variable V42 in M5

T. C. Burwell, T. M. Corwin (UNC Charlotte), B. W. Carney (UNC Chapel Hill), D. W. Latham (Harvard-Smithsonian CfA), S. C. Danford (UNC Greensboro)

We present new BV photometry and radial velocities from high- resolution spectroscopy for the Pop. II Cepheid variable V42 in the globular cluster M5. A new ephemeris is computed and V, B, and B-V light curves are given. An improved period of 25.725 days has been determined. A CMD of M5 is presented with V42 included. We intend to utilize these data as part of a project to derive the distance and absolute magnitudes of V42 using the Baade-Wesselink method, and to compare this result with the result of an earlier B-W analysis of two RR Lyraes in M5. This will help tie the RR Lyrae and cepheid Baade-Wesselink methods together.

Program listing for Thursday