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J/AJ/109/1095       Thick Disk Chemical Abundance Distribution (Gilmore+ 1995)
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A determination of the thick disk chemical abundance distribution:
implications for galaxy evolution.
      Gilmore G., Wyse R.F.G., Jones J.B.
     <Astron. J. 109, 1095 (1995)>
     =1995AJ....109.1095G      (SIMBAD/NED Reference)
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ADC_Keywords: Photometry, photographic ; Stars, distances ; 
	      Effective temperatures 

Description:
    We present a determination of the thick disk iron abundance
    distribution obtained from an in situ sample of F/G stars. These stars
    are faint, 15<=V=<18, selected on the basis of color, being a subset
    of the larger survey of Gilmore and Wyse designed to determine the
    properties of the stellar populations several kiloparsecs from the
    Sun. The fields studied in the present paper probe the iron abundance
    distribution of the stellar populations of the galaxy at 500-3000pc
    above the plane, at the solar Galactocentric distance. The derived
    chemical abundance distributions are consistent with no metallicity
    gradients in the thick disk over this range of vertical distance, and
    with an iron abundance distribution for the thick disk that has a peak
    at -0.7dex. The lack of a vertical gradient argues against slow,
    dissipational settling as a mechanism for the formation of the thick
    disk. The photometric and metallicity data support a turn-off of the
    thick disk that is comparable in age to the metal-rich globular
    clusters, or >=12Gyr, and are consistent with a spread to older ages.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2.dat         55      133   Observed and derived data for South Galactic
                                  Pole stars
table4.dat         55       87   Observed and derived data for UK Schmidt
                                  Field 117 stars (l, b)=(270, -45)
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Byte-by-byte Description of file: table2.dat, table4.dat
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   Bytes Format Units   Label     Explanations
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       1  I1    h       RAh       Right ascension 1950.0
   3-  4  I2    min     RAm       Right ascension 1950.0
   6- 10  F5.2  s       RAs       Right ascension 1950.0
      12  A1    ---     DE-       Declination sign
  13- 14  I2    deg     DEd       Declination 1950.0
  16- 17  I2    arcmin  DEm       Declination 1950.0
  19- 22  F4.1  arcsec  DEs       Declination 1950.0
  24- 28  F5.2  mag     Vmag      V magnitude
  30- 33  F4.2  mag     B-V       B-V color index
  35- 38  F4.2  mag     V-I       V-I color index
  40- 44  F5.2  Sun     [Fe/H]    Metallicity
  46- 49  I4    pc      Dist      Distance from photometric parallax
  51- 54  I4    K       Teff      Effective temperature from V-I
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Courtesy: Rosie Wyse <wyse@physics.Berkeley.EDU>

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(End)                                        Patricia Bauer  [CDS]   14-Jun-1996