Volume 410, Number 3, November II 2003
|Page(s)||795 - 801|
|Published online||17 November 2003|
Carbon star survey in the Local Group*
VII. NGC 3109 a galaxy without a stellar halo
Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada e-mail: email@example.com
2 INAF, Osservatorio Astronomico di Roma Viale del Parco Mellini 84, 00136 Roma, Italia e-mail: firstname.lastname@example.org
Corresponding author: S. Demers, email@example.com
Accepted: 19 August 2003
We present a CFH12K wide field survey of the carbon star population in and around NGC 3109. Carbon stars, the brightest members of the intermediate-age population, were found nearly exclusively in and near the disk of NGC 3109, ruling out the existence of an extensive intermediate-age halo like the one found in NGC 6822. Over 400 carbon stars identified have , confirming the nearly universality of mean magnitude of C star populations in Local Group galaxies. Star counts over the field reveal that NGC 3109 is a truncated disk shaped galaxy without an extensive stellar halo. The minor axis star counts reach the foreground density between 4' and 5', a distance that can be explained by an inclined disk rather than a spheroidal halo. We calculate a global C/M ratio of , a value expected for such a metal poor galaxy.
Key words: galaxies: individual: NGC 3109 / galaxy stellar content / galaxy structure
© ESO, 2003
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