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J/A+A/436/91        C star population in outer disk of M31     (Demers+, 2005)

The C star outer disk population of M31 seen with the SLOAN filters. Demers S., Battinelli P. <Astron. Astrophys. 436, 91 (2005)> =2005A&A...436...91D
ADC_Keywords: Stars, carbon ; Photometry, CCD ; Photometry, SDSS Keywords: galaxies: individual: M31 - stars: carbon Abstract: We employ the CFHT Megacam camera to survey ∼1°2 of the southern outer disc of M31, a region which includes the area where Battinelli et al. (2003, Cat. J/AJ/125/1298) 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. Description: The observations presented in this paper consist of one Megacam filed, centered on RA=00:37:02.3, DE=+39:40:50 (J2000.0), obtained in Service Queue Observing mode in August 2003. TheMegacam camera is installed at the prime focus of the 3.66m Canada-France-Hawaii Telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 76 463 Positions and photometry of 463 C stars
See also: J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003) J/AJ/125/3037 : RI photometry of NGC 205 carbon stars (Demers+, 2003) J/A+A/424/125 : Carbon stars in IC10 (Demers+, 2004) J/A+AS/97/603 : C stars in SMC (Rebeirot+ 1993) J/A+A/416/111 : C stars in Wolf-Lundmark-Melotte galaxy (Battinelli+, 2004) J/A+A/417/479 : RI photometry of NGC 185 carbon stars (Battinelli+, 2004) J/A+A/410/795 : Photometry of NGC 3109 carbon stars (Demers+, 2003) J/AJ/125/3037 : RI photometry of NGC 205 carbon stars (Demers+, 2003) J/AJ/120/1801 : C stars in Pegasus, DDO 210 and Tucana (Battinelli+, 2000) J/AJ/119/2780 : C stars in IC 1613 (Albert+, 2000) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
3- 5 I3 --- Seq Running number 8- 16 F9.7 deg RAdeg Right ascension (J2000.0) 19- 28 F10.7 deg DEdeg Declination (J2000.0) 31- 36 F6.3 --- i'mag SDSS i' magnitude 40- 44 F5.3 --- e_i'mag Error on i'mag 48- 52 F5.3 --- (r'-i') SDSS (r'-i') colour index 56- 60 F5.3 --- e_(r'-i') Error on (r'-i') 64- 68 F5.3 --- (g'-r') SDSS (g'-r') colour index 72- 76 F5.3 ---- e_(g'-r') Error on g'-r'
Acknowledgements: Serge Demers, demers(at)astro.umontreal.ca Paolo Battinelli, battinel(at)oarhp1.rm.astro.it
(End) Patricia Vannier [CDS] 08-Mar-2005
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