J/A+A/511/L10   Abundances and space velocities of 94 stars   (Nissen+, 2010)
================================================================================
Two distinct halo populations in the solar neighborhood. Evidence from stellar
abundance ratios and kinematics.
    Nissen P.E., Schuster W.J.
   <Astron. Astrophys. 511, L10 (2010)>
   =2010A&A...511L..10N
================================================================================
ADC_Keywords: Stars, nearby ; Abundances ; Space velocities
Keywords: stars: abundances - stars: kinematics - Galaxy: halo -
          Galaxy: formation

Abstract:
    Precise abundance ratios are determined for 94 dwarf stars with
    5200<Teff<6300K, -1.6<[Fe/H]<-0.4, and distances D<~335pc. Most of
    them have halo kinematics, but 16 thick-disk stars are included.

    Equivalent widths of atomic lines are measured from VLT/UVES and
    NOT/FIES spectra with resolutions R~55000 and R~40000,
    respectively. An LTE abundance analysis based on MARCS models is
    applied to derive precise differential abundance ratios of Na, Mg, Si,
    Ca, Ti, Cr, and Ni with respect to Fe.

Description:
    Atmospheric parameters, abundance ratios, and space velocities are
    given for halo and thick-disk stars observed with the ESO VLT/UVES and
    NOT/FIES spectrographs at high resolution.

File Summary:
--------------------------------------------------------------------------------
 FileName   Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe         80        .   This file
stars.dat      74       94   Star list
table3.dat     97       53   Data based on VLT/UVES spectra
table4.dat     97       47   Data based on NOT/FIES spectra
--------------------------------------------------------------------------------

Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     Name      Simbad name
      11  A1    ---   m_Name      Multiplicity index on Name
  13- 14  I2    h       RAh       Simbad Hour of Right Ascension (J2000.0)
  16- 17  I2    min     RAm       Simbad Minute of Right Ascension (J2000.0)
  19- 22  F4.1  s       RAs       Simbad Second of Right Ascension (J2000.0)
      24  A1    ---     DE-       Simbad Sign of the Declination (J2000.0)
  25- 26  I2    deg     DEd       Simbad Degree of Declination (J2000.0)
  28- 29  I2    arcmin  DEm       Simbad Arcminute of Declination (J2000.0)
  31- 32  I2    arcsec  DEs       Simbad Arcsecond of Declination (J2000.0)
  35- 40  F6.3  mag     Bmag      Simbad B band magnitude
  42- 47  F6.3  mag     Vmag      Simbad V band magnitude
  49- 56  A8    ---     SpType    Simbad MK spectral type
  58- 65  A8    ---     Inst      Instrument used
  67- 74  A8    ---     Inst2     Second Instrument used
--------------------------------------------------------------------------------

Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 10  A10   ---     Name      Object name
      11  A1    ---   m_Name      Multiplicty index on Name
  13- 16  I4    K       Teff      Effective temperature
  18- 21  F4.2  cm/s2   logg      Logarithmic surface gravity
  23- 27  F5.2  [Sun]   [Fe/H]    Iron-to-hydrogen ratio
  29- 31  F3.1  km/s    ksi       Micro-turbulence velocity
  33- 37  F5.2  [Sun]   [Na/Fe]   Sodium-to-iron ratio
  39- 42  F4.2  [Sun]   [Mg/Fe]   Magnesium-to-iron ratio
  44- 47  F4.2  [Sun]   [Si/Fe]   Silicon-to-iron ratio
  49- 52  F4.2  [Sun]   [Ca/Fe]   Calcium-to-iron ratio
  54- 57  F4.2  [Sun]   [Ti/Fe]   Titanium-to-iron ratio
  59- 63  F5.2  [Sun]   [Cr/Fe]   Chromium-to-iron ratio
  65- 69  F5.2  [Sun]   [Ni/Fe]   Nickel-to-iron ratio
  71- 74  I4    km/s    U(LSR)    Galactic U-velocity component relative to LSR
  76- 79  I4    km/s    V(LSR)    Galactic V-velocity component relative to LSR
  81- 84  I4    km/s    W(LSR)    Galactiv W-velocity component relative to LSR
  86- 97  A12   ---     Class     Population (1)
--------------------------------------------------------------------------------
Note (1): Classification of star as belonging to the thick-disk (TD), the
     low-alpha halo, or the high-alpha halo population. For stars with
     [Fe/H]<-1.4, the classification is uncertain and given in parentheses.
--------------------------------------------------------------------------------

Acknowledgements:
    Poul Erik Nissen, pen(at)phys.au.dk
================================================================================
(End)  Poul Erik Nissen [Aarhus University], Patricia Vannier [CDS]  01-Mar-2010
