Light Curves and Period Changes of Type II Cepheids in the Globular Clusters M3 and M5
Katie Rabidoux, Horace A. Smith, Barton J. Pritzl, Wayne Osborn,, Charles Kuehn, Jill Randall, R. Lustig, K. Wells, Lisa Taylor, Nathan De Lee,, K. Kinemuchi, Aaron LaCluyz\'e, D. Hartley, C. Greenwood, M. Ingber, M., Ireland, E. Pellegrini, Mary Anderson, Gene Purdum, J. Lacy
TL;DR
This study analyzes light curves and period changes of Type II Cepheids in globular clusters M3 and M5, revealing diverse period behaviors and confirming alternating cycle patterns in V84.
Contribution
It provides detailed long-term observations of period variations in Type II Cepheids, including new data and analysis of their cycle behaviors in M3 and M5.
Findings
V154's period has increased over time
V42's period has decreased over time
V84 exhibits erratic, non-evolutionary period changes
Abstract
Light curves in the B, V, and I_c passbands have been obtained for the type II Cepheids V154 in M3 and V42 and V84 in M5. Alternating cycle behavior, similar to that seen among RV Tauri variables, is confirmed for V84. Old and new observations, spanning more than a century, show that V154 has increased in period while V42 has decreased in period. V84, on the other hand, has shown large, erratic changes in period that do not appear to reflect the long term evolution of V84 through the HR diagram.
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