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

Details Period Changes and Light Curves of Type II Cepheids in Globular Clusters Period Changes and Light Curves of Type II Cepheids in Globular Clusters

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6013r&link_type=abstract

American Astronomical Society, AAS Meeting #211, #60.13; Bulletin of the American Astronomical Society, Vol. 39, p.845

Astronomy and Astrophysics

Astronomy

4

Scientific paper

Type II Cepheids in globular clusters have long been observed photgraphically, but the light curves of many cluster Cepheids have not been defined using recent CCD photometry. We present new CCD BVI light curves for Type II Cepheids in the globular clusters M3 and M5. The observed period changes of Type II Cepheids can in principle provide information on their direction of evolution through the instability strip. We examine the long term period changes of three type II Cepheids in the globular clusters M3 and M5. V42 in M5 has shown a small decrease in period since 1889. V84 in M5, which shows a more erratic light curve, appears to show irregular fluctuations in period. V154 in M3 shows a recent increase in period. Preliminary results are presented for period changes of Type II Cepheids in the globular cluster M14.
We thank the NSF for support under grant AST 0440061.

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