EDP Sciences
Free access
Volume 417, Number 2, April II 2004
Page(s) 479 - 486
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20034272

A&A 417, 479-486 (2004)
DOI: 10.1051/0004-6361:20034272

Carbon star survey of Local Group galaxies

IX. The spheroidal galaxy NGC 185
P. Battinelli1 and S. Demers2

1  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: demers@astro.umontreal.ca

(Received 2 September 2003 / 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 $\langle I \rangle = 19.99\pm0.05$, corresponding to $\langle M_I\rangle = -4.41\pm0.05$, 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 $\pm$ 0.07 '. The surface density of C stars follows also a power law but with a smaller scale length, $1.56 \pm 0.06$, demonstrating that the intermediate-age population of NGC 185 is more concentrated than its old population. A tidal radius, $r_{\rm t} = 22.5\pm2.2'$ is determined from red giant star counts. The C/M ratio of NGC 185 is $0.17 \pm 0.02$ 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

Offprint request: P. Battinelli, battinel@oarhp1.rm.astro.it

SIMBAD Objects
Tables at the CDS

© ESO 2004

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.