Query : 2005A&A...436...91D

2005A&A...436...91D - Astronomy and Astrophysics, volume 436, 91-99 (2005/6-2)

The C star outer disk population of M31 seen with the SLOAN filters.


Abstract (from CDS):

We employ the CFHT Megacam camera to survey ∼one deg2 of the southern outer disc of M31, a region which includes the area where Battinelli et al. (2003AJ....125.1298B) have identified nearly one thousand C stars. In the outer M31 region not previously surveyed, we identify 361 new C star candidates, having similar photometric properties to the known ones, and confirm the slight decrease in the luminosity of C stars with galactocentric distances. We show that the Sloan g', r', i' filters are a viable approach, comparable to (CN-TiO), to identify C stars. We find that the (g'-r') colours of cool C stars can be so red that prohibitively long g' exposures are needed to acquire faint extragalactic C stars. This makes the Sloan filters a less promising approach to extend a C star survey to several Mpc. Our uniform large field survey detects the edge of M31 disk at ∼35kpc. The intermediate-age population, represented by C stars, extends further to ∼40kpc.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M31 - stars: carbon

VizieR on-line data: <Available at CDS (J/A+A/436/91): table2.dat>

Nomenclature: Table 2: [DB2005] NNN (Nos 1-463).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12387 1
2 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1539 0
3 NAME Local Group GrG ~ ~           ~ 8155 0

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