Issue |
A&A
Volume 410, Number 3, November II 2003
|
|
---|---|---|
Page(s) | 795 - 801 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20031286 | |
Published online | 17 November 2003 |
Carbon star survey in the Local Group*
VII. NGC 3109 a galaxy without a stellar halo
1
Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada e-mail: bruno@astro.rug.nl
2
INAF, Osservatorio Astronomico di Roma Viale del Parco Mellini 84, 00136 Roma, Italia e-mail: battinel@oarhp1.rm.astro.it
Corresponding author: S. Demers, demers@astro.umontreal.ca
Received:
4
June
2003
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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