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J/A+A/375/366       Carbon stars from the Hamburg/ESO survey  (Christlieb+ 2001)
The stellar content of the Hamburg/ESO survey.
II. A large, homogeneously-selected sample of high latitude carbon stars.
    Christlieb NN., Green P.J., Wisotzki L., Reimers D.
   <Astron. Astrophys. 375, 366 (2001)>
   =2001A&A...375..366C
ADC_Keywords: Stars, carbon ; Positional data ; Photometry, UBV ;
              Equivalent widths
Keywords: stars: carbon - surveys - Galaxy: halo


Description:
    This catalog contains 403 Faint High Latitude Carbon (FHLC) stars
    selected from the digitized objective prism plates of the Hamburg/ESO
    Survey (HES). Because of the ∼15Å spectral resolution and high
    signal-to-noise ratio of the HES prism spectra, our automated
    procedure based on the detection of C2 and CN molecular bands
    permits high-confidence identification of carbon stars without the
    need for follow-up spectroscopy. 329 plates (87% of the survey) were
    examined, covering 6400deg2 to a magnitude limit of V∼16.5.

    The catalog lists coordinates, photometry, and carbon band indices for
    403 FHLC stars found in the Hamburg/ESO survey. BJ magnitudes are
    accurate to better than ±0.2mag, including zero point errors. V
    magnitudes, B-V and U-B colors were derived by the procedure described
    in Christlieb et al. (2001A&A...366..898C). We also list an object
    classification for the sources, where "stars", "bright" and "ext"
    refer to point sources, sources above a saturation threshold, and
    sources detected as extended in DSS I images, respectively. We do not
    list V, B-V and U-B for saturated objects, because our color
    calibrations are not valid for them. Finally, we list two selection
    flags.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
hesfhlcs.dat     120      403   Faint High Latitude Carbon (FHLC) stars (Table A1)


See also:
  J/A+A/363/1040 : DB white dwarfs from Hamburg/ESO survey (Friedrich+, 2000)
  J/A+AS/115/235 : The Hamburg/ESO survey for bright QSOs. II. (Reimers+, 1996)
  J/A+A/358/77   : Hamburg/ESO survey for bright QSOs. III. (Wisotzki+, 2000)


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

   Bytes Format  Units   Label    Explanations

   1- 12  A12    ---     HE       HE designation
  14- 15  I2     h       RAh      Right ascension at equinox J2000.0,
                                   derived from DSS I
  17- 18  I2     min     RAm      Right ascension at equinox J2000.0
  20- 23  F4.1   s       RAs      Right ascension at equinox J2000.0
      25  A1     ---     DE-      Declination sign at equinox J2000.0,
                                   derived from DSS I
  26- 27  I2     deg     DEd      Declination at equinox J2000.0
  29- 30  I2     arcmin  DEm      Declination at equinox J2000.0
  32- 33  I2     arcsec  DEs      Declination at equinox J2000.0
  37- 39  I3     ---     Field    ESO-SERC field number
  42- 45  I4     ---     Plate    HES plate number
      47  A1     ---     q        [abcd] Plate quarter
  49- 54  A6     ---     Type     Object type (stars/bright/ext) (1)
  56- 59  F4.1   mag     BJmag    ? BJ magnitude
  61- 64  F4.1   mag     Vmag     ? V magnitude
  67- 70  F4.2   mag     B-V      ? B-V colour index, derived from HES spectra
  73- 76  F4.2   mag     U-B      ? U-B colour index, derived from HES spectra
  79- 83  F5.1   0.1nm   C25165   Band index of C2 5165Å
  86- 90  F5.1   0.1nm   C24737   Band index of C2 4737Å
  92- 99  F8.2   0.1nm   CN4216   Band index of CN 4216Å
 101-106  F6.2   0.1nm   CN3883   Band index of CN 3883Å
     113  I1     ---     n_C2     [0/1] C2 band index selection flag (2)
     120  I1     ---     n_CN     [0/1] CN band index selection flag (2)

Note (1): Object types:
     "stars" refers to point sources
     "bright" refers to sources above a saturation threshold
     "ext" refers to sources detected as extended in DSS I images
Note (2): Stars are selected if both of their C2 indices or both of their
     CN indices fall into the indicated ranges.
     --------------------------------------
     Feature            Index range Å
     --------------------------------------
     C2 5165Å         [10,  91]
     C2 4737Å         [15, 114]
     CN 4216Å         [ 2,  56]
     CN 3883Å         [13,  55]
     --------------------------------------


Acknowledgements: Norbert Christlieb, 

(End)                                        Patricia Bauer [CDS]    15-Aug-2001