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J/A+A/410/795       Photometry of NGC 3109 carbon stars      (Demers+, 2003)
Carbon star survey in the Local Group.
VII. NGC 3109 a galaxy without a stellar halo.
     Demers S., Battinelli P., Letarte B.
    <Astron. Astrophys. 410, 795 (2003)>
    =2003A&A...410..795D
ADC_Keywords: Galaxies, photometry ; Stars, carbon ; Photometry, CCD

Keywords: galaxies: individual: NGC 3109 - galaxies: stellar populations -
          galaxies: structure

Abstract:
    We present a CFH12K wide field survey of the carbon star population in
    and around NGC 3109. Carbon stars, the brightest members of the
    intermediate-age population, were found nearly exclusively in and near
    the disk of NGC 3109, ruling out the existence of an extensive
    intermediate-age halo like the one found in NGC 6822. Over 400 carbon
    stars identified have MI=-4.71, confirming the nearly universality
    of mean magnitude of C star populations in Local Group galaxies. Star
    counts over the field reveal that NGC 3109 is a truncated disk shaped
    galaxy without an extensive stellar halo. The minor axis star counts
    reach the foreground density between 4' and 5', a distance that can be
    explained by an inclined disk rather than a spheroidal halo. We
    calculate a global C/M ratio of 1.75±0.20, a value expected for such
    a metal poor galaxy.

Description:
    We list the apparent I magnitude, (R-I) and (CN-TiO) colour indices of
    471 carbon stars identified in NGC 3109. The observations were obtained
    in March 2002, with the CFH12K camera attached to the CFHT.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        80      446   Positions and photometry of 471 C stars


See also:
    J/AJ/119/2780 : C star in 1613 (Albert+, 2003)
    J/AJ/120/1801 : C stars in Pegasus, DDO 210 and Tucana (Battinelli+, 2000)
    J/AJ/123/832  : C star population in NGC 6822 (Letarte+, 2002)
    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/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/418/33  : RI photometry of C stars in NGC 147 (Battinelli+, 2004)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label    Explanations

   1-  6  I6    ---     Seq      Running number
   8-  9  I2    h       RAh      Right ascension (J2000.0)
  11- 12  I2    min     RAm      Right ascension (J2000.0)
  14- 18  F5.2  s       RAs      Right ascension (J2000.0)
      21  A1    ---     DE-      Declination sign (J2000.0)
  22- 23  I2    deg     DEd      Declination (J2000.0)
  25- 26  I2    arcmin  DEm      Declination (J2000.0)
  28- 32  F5.2  arcsec  DEs      Declination (J2000.0)
  35- 40  F6.3  mag     Imag     I magnitude
  43- 48  F6.3  mag     e_Imag   Error on Imag
  51- 56  F6.3  mag     R-I      R-I colour index
  59- 64  F6.3  mag     e_R-I    Error on R-I
  67- 72  F6.3  mag     CN-TiO   CN-TiO colour index
  75- 80  F6.3  mag    e_CN-TiO  Error on CN-TiO


Acknowledgements: Serge Demers 


References:
    Albert et al.,       Paper I     2000AJ....119.2780A
    Battinelli & Demers, Paper II    2000AJ....120.1801B, Cat. J/AJ/120/1801
    Demers & Battinelli, Paper III   2002AJ....123..238D
    Letarte et al.,      Paper IV    2002AJ....123..832L, Cat. J/AJ/123/832
    Battinelli et al.,   Paper V     2003AJ....125.1298B, Cat. J/AJ/125/1298
    Demers et al.,       Paper VI    2003AJ....125.3037D
    Battinelli & Demers, Paper VIII  2004A&A...418...33B  Cat. J/A+A/418/33
    Battinelli & Demers, Paper IX   2004A&A...417..479B  Cat. J/A+A/417/479
    Battinelli & Demers, Paper X    2004A&A...416..111B  Cat. J/A+A/416/111
(End)    Serge Demers [Universite de Montreal]                       05-Sep-2003