NOAO >   Observing Info >   Approved Programs >   2010A-0160

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Proposal Information for 2010A-0160


PI: Lisa Esch, Yale University, lisa.esch@yale.edu
Address: Astronomy Department, 260 Whitney Ave, New Haven, CT 06511, USA

CoI: Charles Bailyn, Yale University
CoI: Sarbani Basu, Yale University

Title: Determining the Helium Abundance of Pulsating Blue Subdwarfs in Clusters through Asteroseismology

Abstract: We propose to obtain time-series data of blue subdwarf B stars in \omega Centauri to search for pulsations. Our goal is to provide another constraint on the multiple populations that have recently been inferred to exist in this cluster (Lee et al., 2005; Bedin et al., 2004). By using asteroseismology and stellar modeling, we aim to explore the variation in helium abundance of \omega Centauri's subdwarf B stars. Recently a pulsating subdwarf B star was found in \omega Centauri (Randall et al., 2009), demonstrating the feasibility of our approach. We hope to obtain many more examples. Asteroseismology has already been shown to constrain the helium abundance of population one stars and low metallicity stars (Basu et al., 2004). The observations proposed here will be a major part of the PhD thesis of the PI.


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NOAO >   Observing Info >   Approved Programs >   2010A-0160

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