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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 165 17008 Stellar atmospheric parameters, astrometric,
kinematic and dynamic data for the whole sample
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See also:
III/265 : RAVE 3rd data release (Siebert+, 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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)
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History:
From electronic version of the journal
References:
Coskunoglu et al., Paper I 2011MNRAS.412.1237C 2011MNRAS.412.1237C
(End) Patricia Vannier [CDS] 04-Jul-2012