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J/MNRAS/419/2844  Radial metallicity gradient from RAVE DR3  (Coskunoglu+, 2012)
Local stellar kinematics from RAVE data. II. Radial metallicity gradient.
    Coskunoglu B., Ak S., Bilir S., Karaali S., Onal O., Yaz E., Gilmore G.,
    Seabroke G.M.
   <Mon. Not. R. Astron. Soc., 419, 2844-2854 (2012)>
   =2012MNRAS.419.2844C
ADC_Keywords: Surveys ; Radial velocities ; Milky Way ; Stars, F-type ;
              Stars, G-type
Keywords: stars: abundances - Galaxy: abundances - Galaxy: disc -
          Galaxy: evolution

Abstract:
    We investigate radial metallicity gradients for a sample of dwarf
    stars from the RAdial Velocity Experiment (RAVE) Data Release 3 (DR3,
    Cat. III/265). We select a total of approximately 17000 F-type and
    G-type dwarfs, using a selection of colour, log g and uncertainty in
    the derived space motion, and calculate for each star a probabilistic
    (kinematic) population assignment to a thick or thin disc using space
    motion and additionally another (dynamical) assignment using stellar
    vertical orbital eccentricity. We additionally subsample by colour, 
    to provide samples biased toward young thin-disc and older thin-disc
    stars. We derive a metallicity gradient as a function of
    Galactocentric radial distance, i.e. d[M/H]/dRm=-0.051±0.005dex/kpc,
    for the youngest sample, F-type stars with vertical orbital
    eccentricities ev≤0.04. Samples biased toward older thin-disc stars
    show systematically shallower abundance gradients.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat       165    17008   Stellar atmospheric parameters, astrometric,
                             kinematic and dynamic data for the whole sample


See also:
   III/265 : RAVE 3rd data release (Siebert+, 2011)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     Seq       [1/17008] Sequential number
   7- 22  A16   ---     Name      RAVE name, JHHMMSS.s+DDMMSS
  24- 33  F10.6 deg     RAdeg     Right ascension in decimal degrees (J2000)
  35- 44  F10.6 deg     DEdeg     Declination in decimal degrees (J2000)
  46- 50  I5    K       Teff      Effective temperature
  52- 55  F4.2  [cm/s2] logg      Surface gravity
  57- 61  F5.2  [Sun]   [M/H]     Metallicity
  63- 69  F7.2  mas/yr  pmRA      Proper motion along RA (pmRA*cosDE)
  71- 77  F7.2  mas/yr  pmDE      Proper motion along DE
  79- 83  F5.3  kpc     d         Heliocentric distance
  85- 90  F6.1  km/s    HRV       Heliocentric radial velocity, γ
  92- 98  F7.2  km/s    Ulsr      U velocity (in LSR)
 100-104  F5.2  km/s    e_Ulsr    rms uncertainty on Ulsr
 106-112  F7.2  km/s    Vlsr      V velocity (in LSR)
 114-118  F5.2  km/s    e_Vlsr    rms uncertainty on Vlsr
 120-126  F7.2  km/s    Wlsr      W velocity (in LSR)
 128-132  F5.2  km/s    e_Wlsr    rms uncertainty on Wlsr
 134-138  F5.3  kpc     dper      Perigalactic distance
 140-145  F6.3  kpc     dapo      Apogalactic distance
 147-152  F6.3  kpc     zmin      Minimum distance from Galactic plane
 154-158  F5.3  kpc     zmax      Maximum distance from Galactic plane
 160-165  F6.3  ---     TD/D      ?=-99.99 Probability for a star being
                                   classified as a thick-disc star relative to
                                   it being classified as a thin-disc star (1)

Note (1): TD/D = X(TD)/X(D).f(TD)/f(D) if
     * f(TD) (resp. f(D)) are the probabilities of being "a member" of the
       thick disk (resp. thin disk) from the f(U,V,W) velocity distribution
     * X(TD) (resp. X(D)) are local space densities of the thick disk
       (resp. thin disk)


History:
    From electronic version of the journal

References:
    Coskunoglu et al., Paper I    2011MNRAS.412.1237C
(End)                                      Patricia Vannier [CDS]    04-Jul-2012