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J/AJ/139/1051   Carbon-enhanced metal-poor stars in the Galaxy   (Placco+, 2010)
A search for unrecognized carbon-enhanced metal-poor stars in the Galaxy.
    Placco V.M., Kennedy C.R., Rossi S., Beers T.C., Lee Y.S., Christlieb N.,
    Sivarani T., Reimers D., Wisotzki L.
   <Astron. J., 139, 1051-1065 (2010)>
   =2010AJ....139.1051P
ADC_Keywords: Stars, carbon ; Stars, population II; Stars, metal-deficient;
              Abundances
Keywords: Galaxy: halo - stars: abundances - stars: carbon -
          stars: Population II - surveys - techniques: spectroscopic

Abstract:
    We have developed a new procedure to search for carbon-enhanced
    metal-poor (CEMP) stars from the Hamburg/ESO (HES) prism-survey
    plates. This method employs an extended line index for the CH G band,
    which we demonstrate to have superior performance when compared to the
    narrower G-band index formerly employed to estimate G-band strengths
    for these spectra.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        62      132   Stellar data for the observed candidates
table4.dat        52      132   Atmospheric parameters and carbon abundance
                              estimates for the observed candidates


See also:
 J/AJ/128/2402   : Extremely metal-poor star candidates abundances (Lai+, 2004)
 J/ApJS/155/651  : Evolution of extremely metal-poor stars (Herwig+, 2004)
 J/A+A/490/769   : Yields from extremely metal-poor stars (Campbell+, 2008)
 J/A+A/501/519   : Extremely metal-poor turnoff stars abund. (Bonifacio+, 2009)
 J/AJ/132/137    : Abundances of extremely metal-poor carbon stars (Cohen+ 2006)
 J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  2  A2    ---     ---       [HE]
   4- 12  A9    ---     HE        Star name in Hamburg/ESO survey (HHMM-DDMM)
  14- 15  I2    h       RAh       Right ascension (J2000)
  17- 18  I2    min     RAm       Right ascension (J2000)
  20- 23  F4.1  s       RAs       Right ascension (J2000)
      25  A1    ---     DE-       Declination sign (J2000)
  26- 27  I2    deg     DEd       Declination (J2000)
  29- 30  I2    arcmin  DEm       Declination (J2000)
  32- 33  I2    arcsec  DEs       Declination (J2000)
  35- 38  F4.1  mag     BHES      HES B magnitude (from Hamburg/ESO plates)
  40- 43  F4.2  mag     (J-K)0    Deredenned J-K colour index
  45- 48  F4.1  0.1nm   GPE       GP index, 15Å wide G-band index (1)
  50- 52  F3.1  0.1nm   KPHES     KP index (CaII line)
  54- 57  F4.1  0.1nm   GPHES     GPHES index, 26Å G-band index (2)
  59- 62  A4    ---     Tag       Remarks and notes (3)

Note (1): This index is a pseudo-equivalent width that measures the
     contrast between the observed spectra and the continuum level.
Note (2): G-band index for use with the scanned HES spectra, GPHES, of
     width 26 Å calibrated to be on a similar scale as the GP index.
Note (3): Tag as follows:
   mpca = Absent CaII K line
   mpcb = Weak CaII K line
   mpcc = Strong CaII K line
   unid = CaII K line not found
   fhlc = Faint high-latitude carbon stars
   habs = Strong absorption H lines
   hbab = Horizontal-branch/A type star
   nois = Low S/N
   ovl  = Overlapping spectra
   art  = Artifacts on photographic plates


Byte-by-byte Description of file: table4.dat

   Bytes Format Units     Label     Explanations

   1-  2  A2    ---       ---       [HE]
   4- 12  A9    ---       HE        Star name in Hamburg/ESO survey (HHMM-DDMM)
  14- 19  F6.1  km/s      RV        Radial velocity
  21- 24  F4.1  km/s      e_RV      rms uncertainty on RV
  26- 29  I4    K         Teff      Effective temperature
  31- 34  F4.2  [cm/s+2]  logg      Surface gravity
  36- 40  F5.2  [-]       [Fe/H]    Metallicity
      42  A1    ---       l_[C/Fe]  Limit flag on [C/Fe] (upper limit)
  43- 47  F5.2  [-]       [C/Fe]    ? Abundance, [C/Fe]
  49- 52  F4.2  [-]       e_[C/Fe]  ? rms uncertainty on [C/Fe]


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    16-May-2012