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J/AZh/79/510      Galactic orbits of RR Lyrae variable stars    (Borkova+, 2002)

Subsystems of RR Lyrae variable Stars in our Galaxy. Borkova T.V., Marsakov V.A. <Astron. Zh. 79, 510 (2002)> =2002AZh....79..510B =2002ARep...46..460B
ADC_Keywords: Stars, variable ; Stars, distances ; Abundances, [Fe/H] ; Space velocities Abstract: We have used published, high-accuracy, ground-based and satellite proper-motion measurements, a compilation of radial velocities, and photometric distances to compute the spatial velocities and Galactic orbital elements for 174 RR Lyrae (ab) variable stars in the solar neighborhood. The computed orbital elements and published heavy-element abundances are used to study relationships between the chemical, spatial, and kinematic characteristics of nearby RR Lyrae variables. We observe abrupt changes of the spatial and kinematic characteristics at the metallicity [Fe/H]~-0.95 and also when the residual spatial velocities relative to the LSR cross the critical value Vres∼290km/s. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 38 174 Orbital elements for nearby RR Lyrae variables
See also: III/176 : RR Lyrae Metallicities (Layden 1994) J/AJ/108/1016 : Kinematics of local RR Lyrae stars. I. (Layden, 1994) J/AJ/110/2288 : Kinematics of local RR Lyrae stars. II. (Layden 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Name 10- 14 F5.2 [Sun] [Fe/H] Metallicity 16- 19 I4 km/s Theta Galactic azimuthal velocity component 21- 23 I3 km/s Vres Full residual velocity relative to the local solar centroid (with (U,V,W)=(-10, 10, 6)km/s) 25- 28 F4.1 kpc Ra Maximum distance of the orbit for the Galatic centre (orbital apogalactic radius) 30- 33 F4.1 kpc Zmax Maximum distance from the Galactic plane 35- 38 F4.2 --- e Eccentricity of galactic orbit (1)
Note (1): Eccentricity, e=(Ra-Rmin)/(Ra+Rmin), where Rmin is the minimum distance of the orbit from the Galactic center.
History: From electronic version of the paper
(End) James Marcout, Patricia Bauer [CDS] 27-Sep-2002
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