Volume 417, Number 2, April II 2004
|Page(s)||479 - 486|
|Published online||19 March 2004|
Carbon star survey of Local Group galaxies*
IX. The spheroidal galaxy NGC 185
INAF, Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italia
2 Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec, H3C 3J7, Canada e-mail: email@example.com
Corresponding author: P. Battinelli, firstname.lastname@example.org
Accepted: 15 December 2003
We used the CFH12K wide field camera to survey the carbon star population of NGC 185 using the CN-TiO technique. 145 C stars are identified with a mean , corresponding to , a mean luminosity similar to what was recently found for the C star population of NGC 147. The stellar surface density profile of NGC 185 follows a power law with an exponential scale length of 2.53 ± 0.07'. The surface density of C stars follows also a power law but with a smaller scale length, , demonstrating that the intermediate-age population of NGC 185 is more concentrated than its old population. A tidal radius, is determined from red giant star counts. The C/M ratio of NGC 185 is with no apparent sign of a radial gradient. We compare the carbon star populations of NGC 185 and NGC 147 to conclude that it is unlikely that they form a close pair.
Key words: galaxies: individual: NGC 185 / galaxies: stellar content / galaxies: structure
© ESO, 2004
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