ADC/CDS Standard Document for Catalog:
/journal_tables/AJ/121/2159/

1. Use the ADC Data Viewer Suite to visualize the data.
2. Get the data files via anonymous FTP. (See Note.)

J/AJ/121/2159       Basic parameters for 372 A, F & G stars       (Gray+, 2001)
================================================================================
The physical basis of luminosity classification in the late A-, F-, and
early G-type stars.
II. Basic parameters of program stars and the role of microturbulence.
    Gray R.O., Graham P.W., Hoyt S.R.
      <Astron. J. 121, 2159 (2001)>
      =2001AJ....121.2159G      (SIMBAD/NED BibCode)
================================================================================
ADC_Keywords: Stars, late-type ; Reddening ; Abundances, [Fe/H] ;
              Effective temperatures
Keywords: stars: abundances - stars: atmospheres -
          stars: fundamental parameters - stars: late-type -
          methods: data analysis - methods: numerical

Abstract:
    Paper I (Cat. <J/AJ/121/2148>) of this series presented precise MK
    spectral types for 372 late A-, F-, and early G-type stars with the
    aim of understanding the nature of luminosity classification on the MK
    spectral classification system for this range of spectral types. In
    this paper, a multidimensional downhill simplex technique is
    introduced to determine the basic parameters of the program stars from
    fits of synthetic spectra and fluxes with observed spectra and fluxes
    from Strvmgren uvby photometry. This exercise yields useful
    calibrations of the MK spectral classification system but, most
    importantly, gives insight into the physical nature of luminosity
    classification on the MK spectral classification system. In
    particular, we find that in this range of spectral types,
    microturbulence appears to be at least as important as gravity in
    determining the MK luminosity type.

File Summary:
--------------------------------------------------------------------------------
 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table1.dat        51      232   Basic parameters of late A-, F-, and
                                 early G-Type Stars
--------------------------------------------------------------------------------

See also:
    J/AJ/121/2148 : Precise spectral types for 372 A-G stars (Gray+, 2001)

Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1-  6  I6    ---     HD        The HD (Cat. <III/135>) number
   8- 11  A4    ---     HR        The HR (Cat. <V/50>) designation
  13- 26  A14   ---     Name      Star name
  28- 31  F4.2  mag     E(b-y)    The E(b-y) reddening
  33- 36  I4    K       Teff      The effective temperature
  38- 41  F4.2  [cm/s2] log(g)    Logarithm of the surface gravity
  43- 45  F3.1  km/s    xi        Microturbulent velocity
  47- 51  F5.2  [Sun]   [M/H]     Metallicity determined by the simplex method
--------------------------------------------------------------------------------

History:
    From electronic version of the journal

================================================================================
(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    19-Jun-2001