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 2002AZh....79..510B
=2002ARep...46..460B 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 38 174 Orbital elements for nearby RR Lyrae variables
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Eccentricity, e=(Ra-Rmin)/(Ra+Rmin), where Rmin is the
minimum distance of the orbit from the Galactic center.
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History:
From electronic version of the paper
(End) James Marcout, Patricia Bauer [CDS] 27-Sep-2002