| Issue |
A&A
Volume 424, Number 1, September II 2004
|
|
|---|---|---|
| Page(s) | 125 - 132 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20040552 | |
| Published online | 17 August 2004 | |
A Carbon star approach to IC 10: Distance and correct size *,**
1
Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
2
INAF – Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italia e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
3
Kapteyn Astronomical Institute, Posbus 800, Groningen, 9700 AV, The Netherlands e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
29
March
2004
Accepted:
26
May
2004
Abstract
We present wide field CFH12K observations of the highly
reddened Local Group galaxy IC 10. Using R, I, CN and TiO filters we
identify 676 carbon stars in the field of IC 10. After mapping the
reddening in the field, from the colours of the G dwarfs seen along the
line of sight, we determine the mean apparent magnitude of the
C star population to be 
, leading to a
true modulus of 
(
kpc). The old
red giant stars define an asymmetric halo.
With a halo diameter of at least 30', IC 10 is among the largest
dwarfs of the Local Group.
The surface density of C stars
follows a radial power law with a scale length of 2.36', a value nearly
identical to the scale length defined by the old giants thus IC 10 has
a stellar halo where the old and intermediate-age populations are
well mixed.
Key words: galaxies: individual: IC 10 / stars: carbon / galaxies: local group / galaxies: structure
Based on observations carried out at the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France, and the University of Hawaii.
Full Table [see full text] is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/424/125
© ESO, 2004
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