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J/A+A/442/229     RR Lyr: kinematics, orbits and z-distribution (Maintz+, 2005)

RR Lyrae stars: kinematics, orbits and z-distribution. Maintz G., De Boer K.S. <Astron. Astrophys., 442, 229-237 (2005)> =2005A&A...442..229M
ADC_Keywords: Stars, variable ; Space velocities Keywords: astrometry - stars: kinematics - stars: variables: RR Lyr - Galaxy: halo - Galaxy: structure Abstract: RR Lyrae stars in the Milky Way are good tracers to study the kinematic behaviour and spatial distribution of older stellar populations. A recently established well documented sample of 217 RR Lyr stars with V<12.5mag, for which accurate distances and radial velocities as well as proper motions from the Hipparcos and Tycho-2 catalogues are available, has been used to reinvestigate these structural parameters. The kinematic parameters allowed to calculate the orbits of the stars. Nearly 1/3 of the stars of our sample have orbits staying near the Milky Way plane. Description: The RR Lyrs used for the present investigation are taken from the well documented sample established by Maintz (2005, Cat. J/A+A/442/381). For the present investigation we restricted ourselves to those RR Lyrs from her list which were observed in the Hipparcos mission (see The Hipparcos and Tycho Catalogues, ESA 1997, Cat. I/239, and the Tycho 2 catalogue, Hog et al. 2000, Cat. I/259). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 89 217 Positions, velocities (given in the Galactic euclidic system XYZUVW and Θ, Φ) and orbital data (Ra, Rp, zmax, normalised z-extent, and eccentricity) of the stars of our sample
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) J/A+A/442/381 : Precise positions of RR Lyrae with Vmax>12.5 (Maintz, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Name of the variable (GCVS) 11- 15 F5.2 kpc X Galactic position X 17- 21 F5.2 kpc Y Galactic position Y 23- 27 F5.2 kpc Z Galactic position Z 29- 34 F6.1 km/s Uvel U velocity 36- 41 F6.1 km/s Vvel V velocity 43- 48 F6.1 km/s Wvel W velocity 50- 55 F6.1 km/s Phi Velocity towards the galactic centre 57- 62 F6.1 km/s Theta Orbital velocity projected to the galactic plane 64- 68 F5.2 kpc Ra Apo-galactic distance 70- 73 F4.2 kpc Rp Peri-galactic distance 75- 79 F5.2 kpc zmax Maximum z-distance reached 81- 84 F4.2 --- nze Normalised z-extent (zmax/R(zmax)) 86- 89 F4.2 --- ecc Eccentricity of the orbit
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Jul-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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