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American Astronomical Society, Astronomical Journal, 6(139), p. 2300-2307, 2010

DOI: 10.1088/0004-6256/139/6/2300

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Light Curves and Period Changes of Type II Cepheids in the Globular Clusters M3 and M5

Journal article published in 2010 by Katie Rabidoux, Horace A. Smith, Barton J. Pritzl, Wayne Osborn, Charles Kuehn, Jill Randall, R. Lustig, K. Wells, Lisa Taylor, Nathan De Lee ORCID, K. Kinemuchi, Aaron LaCluyzé, D. Hartley, C. Greenwood, M. Ingber and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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. ; Comment: 28 pages, 12 figures