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J/A+A/445/69        JHK' photometry of C stars in NGC 147          (Sohn+, 2006)
Near-IR photometry of asymptotic giant branch stars in the dwarf elliptical
galaxy NGC 147.
    Sohn Y.J., Kang A., Rhee J., Shin M., Chun M.S., Kim H.I.
   <Astron. Astrophys. 445, 69 (2006)>
   =2006A&A...445...69S
ADC_Keywords: Galaxies, nearby ; Photometry, infrared ; Stars, carbon ;
              Stars, giant
Keywords: galaxies: individual: NGC 147 - galaxies: stellar content -
          stars: AGB and post-AGB

Abstract:
    Near-infrared J, H and K' images were used to investigate the stellar
    contents of the asymptotic giant branch (AGB) population in the nearby
    dwarf elliptical galaxy NGC 147. The obtained (K,J-K) and (K,H-K)
    color-magnitude diagrams contain stars of AGB and red giant branch
    populations, where the former consists of a group of bright blue
    stars, a dominant population of M giant and a red C star population.We
    identified 91 AGB C stars in NGC 147 with the mean absolute magnitude
    and colors of <MK≥-7.56, <(J-K)0≥1.81 and <(H-K)0≥0.74. The
    estimated number ratio of C stars to M giant stars (C/M) is
    0.16±0.02. The estimated local C/M ratios of 0.14±0.02 for the
    inner region (r<70") and 0.19±0.03 for the outer region (r>70")
    indicate a weak radial gradient. The mean bolometric magnitude of 91 C
    stars in NGC 147 is <Mbol≥-4.32±0.49. The bolometric luminosity
    function of M giant stars in NGC 147 extends up to Mbol=-5.8
    magnitude, and that of only C stars spans -5.6<Mbol←3.5. The color
    histograms of AGB stars in (J-K) and (H-K) show a main peak containing
    M giant stars, a red tail containing C stars with a weak excess, and a
    blue excess possibly due to bright blue foreground stars and AGB stars
    younger than M giants. The comparison of the theoretical isochrone
    models with the color distribution and the brightness of AGB stars
    indicates that most of the bright M giants in NGC 147 were formed at
    log(tyr)∼8.4 with a range of 8.2∼8.6. Ages of the majority of M
    giant stars in NGC 147 are similar to those of younger M giant stars
    in its companion NGC 185, while their formation occurred more recently
    than the older M giant stars in NGC 185 by ∼2Gyrs.

Description:
    The equatorial coordinates, near-infrared photometric properties of 91
    C stars, and color indices in VRI bands of cross-identified C stars
    with Nowotny et al. (2003, Cat. J/A+A/403/93) and Battinelli &
    Demers (2004, Cat. J/A+A/418/33).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        82       91   Coordinates and near-IR photometric properties
                             for 91 C stars


See also:
  J/A+A/403/93 : Photometry of AGB stars in NGC 185 and NGC 147 (Nowotny+, 2003)
  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-  2  I2    ---     Seq       ID number of C star
   4-  5  I2    h       RAh       Right Ascension J2000 (hours)
   7-  8  I2    min     RAm       Right Ascension J2000 (minutes)
  10- 14  F5.2  s       RAs       Right Ascension J2000 (seconds)
      16  A1    ---     DE-       Declination J2000 (sign)
  17- 18  I2    deg     DEd       Declination J2000 (degrees)
  20- 21  I2    arcmin  DEm       Declination J2000 (minutes)
  23- 26  F4.1  arcsec  DEs       Declination J2000 (seconds)
  28- 33  F6.3  mag     K'mag     K' band (2.12um) magnitude of C star
  35- 39  F5.3  mag     e_K'mag   Error of K magnitude
  41- 45  F5.3  mag     (J-K')    (J-K') color index
  47- 51  F5.3  mag     e_(J-K')  Error of (J-K') color index
  53- 57  F5.3  mag     (H-K')    (H-K') color index
  59- 63  F5.3  mag     e_(H-K')  Error of (H-K') color index
  65- 68  F4.2  mag     (V-i)0    ? (V-i) color index by Nowotny et al., 2003,
                                    Cat. J/A+A/403/93
  70- 72  I3    ---     Nowotny   ? ID number of Nowotny et al., 2003,
                                    Cat. J/A+A/403/93, recno number in Vizir
  74- 78  F5.3  mag     R-I       ? (R-I) color index by Battinelli & Demers,
                                    2004, Cat. J/A+A/418/33
  80- 82  I3    ---    [BD2004c]  ? ID number of Battinelli & Demers, 2004,
                                    Cat. J/A+A/418/33


Acknowledgements: Aram Kang, breeze82(at)galaxy.yonsei.ac.kr

(End)                                        Patricia Vannier [CDS]  06-Sep-2005