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J/A+A/314/191     Atmospheric parameters in metal-poor stars. I (Gratton+, 1996)
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Abundances of light elements in metal-poor stars. I.
Atmospheric parameters and a new Teff scale.
     Gratton R.G., Carretta E., Castelli F.
    <Astron. Astrophys. 314, 191 (1996)>
    =1996A&A...314..191G      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, metal-deficient ; Abundances
Keywords: stars: fundamental parameters - stars: atmospheres -
          stars: abundances - stars: population II

Abstract:
    We present atmospheric parameters for about 300 stars of different
    chemical composition, whose spectra will be used to study the galactic
    enrichment of Fe and light elements. These parameters were derived
    using an homogeneous iterative procedure, which considers new
    calibrations of colour-T_eff_ relations for F, G and K-type stars
    based on Infrared Flux Method (IRFM) and interferometric diameters for
    population I stars, and the Kurucz (1992) model atmospheres. We found
    that these calibrations yield a self-consistent set of atmospheric
    parameters for T_eff_>4400K, representing a clear improvement over
    results obtained with older model atmospheres. Using this T_eff_
    -scale and Fe equilibrium of ionization, we obtained very low
    gravities (implying luminosities incompatible with that expected for
    RGB stars) for metal-poor stars cooler than 4400K; this might be due
    either to a moderate Fe overionization (expected from statistical
    equilibrium calculations) or to inadequacy of Kurucz models to
    describe the atmospheres of very cool giants. Our T_eff_ scale is
    compared with other scales recently used for metal-poor stars; it
    agrees well with those obtained using Kurucz (1992) models, but it
    gives much larger T_eff_'s than those obtained using OSMARCS models
    (Edvardsson et al. 1993). This difference is attributed to the
    different treatment of convection in the two sets of models. For the
    Sun, the Kurucz (1992) model appears to be preferable to the OSMARCS
    ones because it better predicts the solar limb darkening; furthermore,
    we find that our photometric T_eff_ 's for metal-poor stars agree well
    with both direct estimates based on the IRFM, and with T_eff_'s
    derived from H{alpha} wings when using Kurucz models.

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
tables          68        287    Tables 2,3,4,5 and 6 of the paper
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See also:
   J/A+A/350/955 : Atmospheric parameters in metal-poor stars. II 
                   (Gratton+, 1999)

Byte-by-byte Description of file: tables
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   Bytes Format Units   Label     Explanations
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       2  I1    ---     Table     [2/6] Number of the table (1)
   4- 13  A10   ---     Star      Designation
  15- 16  I2    h       RAh       ? Right Ascension 2000 (hours) (2)
  18- 19  I2    min     RAm       ? Right Ascension 2000 (minutes) (2)
  21- 24  F4.1  s       RAs       ? Right Ascension 2000 (seconds) (2)
      26  A1    ---     DE-       Declination 2000 (sign) (2)
  27- 28  I2    deg     DEd       ? Declination 2000 (degrees) (2)
  30- 31  I2    arcmin  DEm       ? Declination 2000 (minutes) (2)
  33- 34  I2    arcsec  DEs       ? Declination 2000 (seconds) (2)
  38- 41  I4    K       Teff      Effective Temperature
  43- 47  F5.2 [cm/s2]  logg      Suface gravity
  50- 54  F5.2 [Sun]    [A/H]     Abundance [A/H] (logarithmic scale)
  57- 60  F4.2  km/s    Vel       Microturbulent velocities
  63- 68  F6.3  ---     Slope     ? Slope of relation between abundances and
                                     excitation potential (Only in table2)
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Note (1): The table number specifies the sample:
      2 = Atmospheric parameters for stars of original sample
      3 = Atmospheric parameters for stars of TLLS sample
          (Tomkin et al., 1992AJ....104.1568T)
      4 = Atmospheric parameters for stars of SKPL sample
          (Sneden et al., 1991AJ....102.2001S)
      5 = Atmospheric parameters for stars of E93 sample
          (Edvardsson et al., 1993A&A...275..101E)
      6 = Atmospheric parameters for stars of ZM90 sample
          (Zhao & Magain, 1990A&A...238..242Z)
Note (2): the positions of the stars have been added at CDS,
     using the SIMBAD data-base.  There is one star
     ("anon" in Table 4) for which no position could be found.
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Acknowledgement: R.G. Gratton <gratton@pdmida.pd.astro.it>
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(End)         Patricia Bauer, Francois Ochsenbein [CDS]              24-Oct-1996