The Ancient stellar population of Leo A.

Details The Ancient stellar population of Leo A. The Ancient stellar population of Leo A.

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..199s&link_type=abstract

NOAO Proposal ID #2010A-0199

Computer Science

Scientific paper

The primary goal of our proposal is the characterisation of the oldest stellar populations in Leo A using the properties of ancient RR Lyrae variable stars as tracers. Well known and long established correlations exist between the periods and luminosities of RR Lyrae variable stars and their ages and metallicities. Combining our Gemini study of the properties of RR Lyrae variable stars with deep HST/ACS imaging of the oldest main sequence turnoffs in Leo A will allow us to make a uniquely detailed study of the star formation history of Leo A at the earliest times. This will enable us to study how the formation and evolution of Leo A was affected (if at all) by events in the early universe, such as the formation of the first stars and the Epoch of Reionisation. This is a re-submission because our previous observations, in February-March 2009, suffered from bad weather conditions and did not allow us to complete more than 15% of our programme.

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