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J/A+A/312/93       Cataclysmic variables systemic-velocity (van Paradijs+, 1996)

The systemic-velocity distribution of cataclysmic variables Van Paradijs J., Augusteijn T., Stehle R. <Astron. Astrophys. 312, 93 (1996)> =1996A&A...312...93V (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Radial velocities Keywords: accretion, accretion disks - cataclysmic variables - stars: kinematics; distances Description: We have collected γ velocities of cataclysmic variables from a survey of published orbital radial-velocity studies. We argue that for the non-magnetic cataclysmic variables the γ distribution gives a fair description of the systemic radial velocities; for magnetic cataclysmic variables the effect of motions within the system appears to be substantial. Assuming that the distribution of the spatial velocities of cataclysmic variables in the solar neighbourhood follows the velocity ellipsoid, with dispersions as given by Wielen (1977), we estimate that the dispersion of z-velocities of CVs is in the range 16 to 21km/s. With the galactic potential of Kuijken and Gilmore (1989) we then derive the distribution of distances, z, above the galactic plane. This distribution has an exponential scale height in the range 160-230pc, which is nearly a factor of two larger than that obtained for the z distribution of systems with known distances. This probably reflects the incompleteness of the census of cataclysmic variables at distances even as small as ∼100pc. The velocity distribution of cataclysmic variables indicates that they are an old disk population, with a mix of ages up to 10Gyr. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 70 126 Radial velocities of cataclysmic variables table1.tex 80 333 LaTeX version of table1 refs 67 161 References
See also: V/82 : Cataclysmic binaries (Ritter & Kolb, 1995) Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 12 A12 --- Name Source name 14- 19 A6 --- Type Type (1) 22- 25 I4 km/s RV Radial velocity 26 A1 --- u_RV Uncertainty flag on radial velocity 28- 48 A21 --- Ref Reference codes (see refs file)
Note (1): the types are: AM AM Herculis (subtype cataclysmic variables) DN Dwarf Nova (subtype cataclysmic variables) DQ DQ Herculis (subtype cataclysmic variables) IP Intermediate Polars NA Novae A type NB Novae B type NL Nova like objects SU SU Ursae Majoris (subtype cataclysmic variables) UG U Geminorum (subtype cataclysmic variables) UX UX Ursae Majoris (subtype cataclysmic variables) ZC Z Camelopardalis (subtype cataclysmic variables) For more information see: B. Warner, 'Cataclysmic Variables', Cambridge University Press (1995) or H. Ritter and U. Kolb, in 'X-ray Binaries', Eds W.H.G. Lewin, J. van Paradijs, & E.P.J. van den Heuvel, Cambridge University Press (1995) (catalog V/82)
Byte-by-byte Description of file: refs
Bytes Format Units Label Explanations
1- 3 I3 --- Ref Reference number 7- 65 A59 --- Text Text of reference

(End) Patricia Bauer [CDS] 02-Feb-1996
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