Deep HST Imaging in 47 Tuc and NGC 6397: Variable Stars in 47 Tuc

Details Deep HST Imaging in 47 Tuc and NGC 6397: Variable Stars in 47 Tuc Deep HST Imaging in 47 Tuc and NGC 6397: Variable Stars in 47 Tuc

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715223w&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.23; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained 121 orbits of Hubble Space Telescope imaging observations of the Milky Way globular cluster, 47 Tucanae, from which we can search for stellar variability and transits. Our differential time series photometry covers two fields located outside the cluster core. The first field was observed with the Advanced Camera for Surveys in F606W and F814W covering a 10 month time period and yielding a sample of 20 000 stars. The second field was observed with the Wide Field Camera 3 in F110W and F160W covering 15 days and yielding an approximate sample of 10 000 stars. In this poster, we present the results of our various evaluation methods including phase dispersion minimization and a modified Lomb-Scargle periodogram to identify candidate variables and to determine their periods.

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