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J/ApJ/527/879    Gravities for late-type stars (Allende Prieto+, 1999)
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A consistency test of spectroscopic gravities for late-type stars
    Allende Prieto C., Garcia Lopez R.J., Lambert D.L., Gustafsson B.
   <Astrophys. J. 527, 879 (1999)>
   =1999ApJ...527..879A
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ADC_Keywords: Abundances, [Fe/H] ; Models, atmosphere ; Stars, late-type ;
              Parallaxes, trigonometric ; Stars, late-type
Keywords: stars: abundances - stars: atmospheres - stars:
          fundamental parameters - stars: late-type

Abstract:
    Chemical analyses of late-type stars are usually carried out following
    the classical recipe: LTE line formation and homogeneous,
    plane-parallel, flux-constant, and LTE model atmospheres. We review
    different results in the literature that have suggested significant
    inconsistencies in the spectroscopic analyses, pointing out the
    difficulties in deriving independent estimates of the stellar
    fundamental parameters and hence, detecting systematic errors. The
    trigonometric parallaxes measured by the Hipparcos mission provide
    accurate appraisals of the stellar surface gravity for nearby stars,
    which are used here to check the gravities obtained from the
    photospheric iron ionization balance. We find an approximate agreement
    for stars in the metallicity range -1.0{<~}[Fe/H]{<~}0, but the
    comparison shows that the differences between the spectroscopic and
    trigonometric gravities decrease toward lower metallicities for more
    metal-deficient dwarfs (-2.5{<~}[Fe/H]{<~}-1.0), which casts a shadow
    upon the abundance analyses for extreme metal-poor stars that make use
    of the ionization equilibrium to constrain the gravity.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table1.dat       104      243   Data for the Stars in the Comparison
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See also:
   I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units     Label     Explanations
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   1- 12  A12   ---       Name      Star Name
  15- 19  F5.2  [Sun]     [Fe/H]    Log Iron to Hydrogen abundance ratio
  23- 27  F5.2  solMass   Mass      Mass of the star in solar masses
  31- 35  F5.2  mag       Vmag      V band magnitude
  39- 43  F5.2  mag       VMag      Absolute V band magnitude
  48- 51  I4    K         Teff      Effective temperature
  54- 58  F5.2  [cm/s2]   HLogG     Log surface gravity from HIPPARCOS
  62- 66  F5.2  [cm/s2]   SLogG     Log surface gravity from spectroscopic
                                     measurements
  70- 75  F6.2  mas       Plx       Parallax of the star
  78- 81  F4.2  mas     e_Plx       Error in Para
      84  A1    ---     r_Name      Reference code number (1)
      86  A1    ---     f_Name      Isochrone reference code number (2)
  89-104  A16   ---       CCDM      Components name of double and multiple
                                     stars from Dommanget & Nys Cat. <I/211>
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Note (1):
    0 = Gratton et al. (1997A&A...314..191G)
    1 = Edvardsson (1998A&A...190..148E)
    2 = Bonnell & Bell (1993MNRAS.264..334B)
    3 = Fuhrmann et al. (1997A&A...323..909F)
    4 = Magain (1989A&A...305..245M)
    5 = Ryan, Norris & Beers (1996ApJ...471..254R)
Note (2):
    0 = within the metallicity range of
        Bergbusch & Vandenberg (1992ApJS...81..163B)
    1 = [Fe/H] too low ([Fe/H] = -2.26 is assumed in the grid of
        Bergbusch & Vandenberg (1992) or [Fe/H] too high ([Fe/H] = -0.47
        is used)
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History:
    From ApJ electronic edition

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(End)                                          Greg Schwarz [AAS]    17-Mar-2000