Physics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop....7d&link_type=abstract
NOAO Proposal ID #2001A-0007
Physics
Scientific paper
This proposal is part of our ongoing C star survey of Local Group dwarf galaxies. The object of this investigation is the Magellanic-type galaxy NGC 3109, located on the fringes of the Local Group. Deep color- magnitude diagrams have revealed the presence of an intermediate age population. Indeed, from its luminosity we can predict (Battinelli & Demers 2000) that NGC 3109 has at least one thousand C stars. Using R,I,CN and TiO photometry we will identify these C stars in two fields centered on the extremities of its obvious stellar disc. The size of the CCD field will allow us to obtain the spatial distribution of these C stars up to 3 kpc from the disc and up to 8 kpc along the disc, further out than the HI rotation curve. These C stars, which are among the brightest intermediate age stars, are particularly suitable to map the periphery of galaxies where the stellar density is so low that the foreground stars are more numerous. Furthermore, they can be used as kinematical probes to investigate the kinematics of the periphery of NGC 3109.
Battinelli Paolo
Demers Serge
Letarte Bruno
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