| 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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.