NOAO >   Observing Info >   Approved Programs >   2014A-0313

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Proposal Information for 2014A-0313


PI: Kathy Vivas, Centro de Investigaciones de Astronomia, akvivas@cida.ve
Address: Ave. Alberto Carnevali, Sector La Hechicera, Merida, Merida 5101-A, Venezuela

CoI: Mario Mateo, University of Michigan
CoI: David Nidever, University of Michigan
CoI: Alistair Walker, CTIO

Title: The Dwarf Cepheid Population in the Sextans Dwarf Spheroidal Galaxy

Abstract: Pulsating stars below the horizontal branch (aka, dwarf cepheids, DC) provide an interesting tool to study the stellar populations and structure of dSph galaxies since stars coming from different evolutionary paths may coexist in the region of the instability strip. We propose to use the large field of view of DECam to survey for the first time the Sextans dSph galaxy for DC. Until now, DC have been searched only in three other extra-galactic systems: Carina, Fornax and the Large Magellanic Clouds. We will use the DC population not only to study the stellar populations in Sextans, but also to compare their properties with those in the galactic field and other extra-galactic systems and to study their use as standard candles in systems for which the metallicty is not necessarily known. RR Lyrae and anomalous cepheids will naturally appear as well in the data adding additional constraints in our study. Multi-epoch observations will be co-added to create deep CMDs in areas larger than previous studies. Finally, we will be able to select targets for spectroscopic follow up to study kinematic and chemical sub-structures within the galaxies.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2014A-0313

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