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J/A+A/431/143   Field horizontal-branch stars in the Galaxy  (Christlieb+, 2005)
The stellar content of the Hamburg/ESO survey. III. Field horizontal-branch
stars in the Galaxy
      Christlieb N., Beers T.C., Thom C., Wilhelm R., Rossi S., Flynn C.,
      Wisotzki L., Reimers D.
     <Astron. Astrophys. 431, 143 (2005)>
     =2005A&A...431..143C
ADC_Keywords: Stars, horizontal branch ; Positional data; Photometry, UBV;
              Colors
Keywords: stars: horizontal-branch - Galaxy: halo -
          Galaxy: kinematics and dynamics - surveys - methods: statistical

Abstract:
    We present a sample of 8321 candidate Field Horizontal-Branch (FHB)
    stars selected by automatic spectral classification in the digital
    data base of the Hamburg/ESO objective-prism survey. The stars are
    distributed over 8225 square degrees of the southern sky, at
    |b|≳30°. The average distance of the sample, assuming that they
    are all FHB stars, is 9.8kpc, and distances of up to ∼30kpc are
    reached. Moderate-resolution spectroscopic follow-up observations and
    $UBV$ photometry of 125 test sample stars demonstrate that the
    contamination of the full candidate sample with main-sequence A-type
    stars is <16%, while it would be up to 50% in a flux-limited sample at
    high galactic latitudes. Hence more than ∼6800 of our FHB candidates
    are expected to be genuine FHB stars. The candidates are being used as
    distance probes for high-velocity clouds and for studies of the
    structure and kinematics of the Galactic halo.

Description:
    Table A.1 contains photometry (UBV, c1), and Balmer line equivalent width
    sums, as derived directly from HES spectra, as well as coordinates of the
    8321 candidate field horizontal-branch stars.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tabla1.dat        66     8321   The Field Horizontal-Branch (FHB) star sample


Byte-by-byte Description of file: tabla1.dat

   Bytes Format Units   Label    Explanations

   2-  3  A2    ---     ---      [HE]
   5- 14  A10   ---     HEname   HE designation (based on 1950 position)
  16- 17  I2    h       RAh      Right ascension (J2000.0)
  19- 20  I2    min     RAm      Right ascension (J2000.0)
  22- 25  F4.1  s       RAs      Right ascension (J2000.0)
      27  A1    ---     DE-      Declination sign (J2000.0)
  28- 29  I2    deg     DEd      Declination (J2000.0)
  31- 32  I2    arcmin  DEm      Declination (J2000.0)
  34- 35  I2    arcsec  DEs      Declination (J2000.0)
  37- 39  I3    ---     Field    ? ESO-SERC field number (1)
  41- 44  F4.1  mag     Bmag     ? B magnitude (1)
  46- 50  F5.2  mag     B-V      B-V colour
  52- 56  F5.2  mag     U-B      U-B colour
  58- 61  F4.2  mag     c1       Stroemgren c1 index
  63- 66  F4.1  0.1nm   Wbal     Sum of equivalent widths of Hbeta,
                                     Hgamma and Hdelta

Note (1): no photometric sequence is available in field #891.



History:
  * 11-Feb-2005: Original version
  * 01-May-2005: B magnitude (31.3) of HE 0301-5342 suppressed

Acknowledgements: Norbert Christlieb, st4b321(at)hs.uni-hamburg.de

(End)              N. Christlieb [Hamburger Sternwarte, Germany]     11-Feb-2005