Analysis of Red Giant Oscillations from a 27 Day ACS/WFC Time-Series on NGC 6397

Details Analysis of Red Giant Oscillations from a 27 Day ACS/WFC Time-Series on NGC 6397 Analysis of Red Giant Oscillations from a 27 Day ACS/WFC Time-Series on NGC 6397

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11254g&link_type=abstract

HST Proposal ID #11254. Cycle 16

Computer Science

Scientific paper

Observations of solar-like oscillations have started to provide excellent results with firm detections in recent years for dwarfs, subgiants and red giant stars -- all with radial velocities. We are now poised to further exploit these recent successes with more systematic exploration of oscillations in stars across the color-magnitude diagram CMD. Giants are of particular interest as allowing tests of stellar structure and evolution in this complicated time in a stars life, while presenting observational signals of much larger amplitude than for dwarfs. Study of stellar oscillations requires unusual combinations of long time coverage to obtain the requisite frequency resolution, and precision to detect the fraction of a mmag amplitude modes to be studied here. Time coverage of one week is a lower limit for study of modes which in the giants will have periods of 0.25-3 days, while intensive observations over multiple weeks would be ideal. We will show excellent success at detecting oscillations in giants all of which are strongly saturated in these data from a 7 day observation program GO 9750 conducted for extrasolar planet detection in the galactic bulge. This proposal is for analysis of giants serendipitously observed as part of GO-10424 a 126 orbit program with ACS/WFC on NGC 6397 to probe the bottom of the white dwarf cooling sequence. These ~400 exposures over 27 days for NGC 6397 will allow asteroseismic results on ~40 giants, including mode lifetime estimates not possible at only 7 days.;

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