The Ancient stellar population of Leo A.

Abhijit Saha, Giuliana Fiorentino, Eline Tolstoy, Andrew Cole

Research output: Contribution to journalEditorialAcademic

Abstract

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.
Original languageEnglish
Pages (from-to)2010
JournalNOAO Proposal ID #2010A-0199
Publication statusPublished - Feb-2010

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