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J/A+A/400/877       White dwarfs 3D kinematics from SPY project   (Pauli+, 2003)

3D kinematics of white dwarfs from the SPY project. Pauli E.-M., Napiwotzki R., Altmann M., Heber U., Odenkirchen M., Kerber F. <Astron. Astrophys. 400, 877 (2003)> =2003A&A...400..877P
ADC_Keywords: Stars, white dwarf ; Radial velocities ; Space velocities ; Proper motions ; Stars, distances Keywords: stars, white dwarfs - stars, kinematics - Galaxy: halo - Galaxy: thick disk - Galaxy: kinematics and dynamics Abstract: We present kinematics of a sample of 107 DA white dwarfs from the SPY project (ESO SN Ia Progenitor surveY) and discuss kinematic criteria for a distinction of thin disk, thick disk, and halo populations. This is the first homogeneous sample of white dwarfs for which 3D space motions have been determined. Since the percentage of old stars among white dwarfs is higher than among main-sequence stars, they are presumably valuable tools in studies of old populations such as the halo and the thick disk. Studies of white dwarf kinematics can help to determine the fraction of the total mass of our Galaxy contained in the form of thick disk and halo white dwarfs, an issue which is still under discussion. Radial velocities and spectroscopic distances obtained by the SPY project are combined with our measurements of proper motions to derive 3D space motions. Galactic orbits and further kinematic parameters are computed. We calculate individual errors of kinematic parameters by means of a Monte Carlo error propagation code. Our kinematic criteria for assigning population membership are deduced from a sample of F and G stars taken from the literature for which chemical criteria can be used to distinguish between thin disk, thick disk and halo. Candidates for thick disk and halo members are selected in a first step from the classical U-V-velocity diagram. Our final assignment of population membership is based on orbits and position in the Jz-eccentricity diagram. We find four halo and twelve thick disk white dwarfs. We also present a systematic study of the effects of ignoring the radial velocity in kinematic investigations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 62 107 Radial velocities, proper motions and spectral distributions table2.dat 66 107 Kinematic parameters of the white dwarfs
See also: J/A+A/378/556 : UVES/VLT spectra of white dwarfs (Koester+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Object name 13 I1 --- Nspectra Number of spectra 15- 20 F6.1 km/s RV Radial velocity 22- 25 F4.1 km/s e_RV Error of radial velocity 27- 30 I4 mas/yr pmRA Proper motion mualpha*cos(delta) 32- 35 I4 mas/yr e_pmRA Error of mualpha 37- 40 I4 mas/yr pmDE Proper motion mudelta 42- 45 I4 mas/yr e_pmDE Error of mudelta 47- 52 F6.1 pc DistSp Spectroscopic distance 54- 57 F4.2 [pc] log(Dist) log of distance 59- 62 F4.2 [pc] e_log(Dist) Error of log of distance
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Object name 13- 16 F4.2 --- ecc Eccentricity of galactic orbit 18- 21 F4.2 --- e_ecc Error of eccentricity 23- 27 I5 Jz z-component of angular momentum 29- 31 I3 e_Jz Error of z-component of angular momentum 33- 38 F6.1 km/s Uvel U velocity 40- 43 F4.1 km/s e_Uvel Error of Uvel 45- 50 F6.1 km/s Vvel V velocity 52- 55 F4.1 km/s e_Vvel Error of Vvel 57- 61 F5.1 km/s Wvel W velocity 63- 66 F4.1 km/s e_Wvel Error of Wvel
Acknowledgements: Eva-Maria Pauli References: Napiwotzki et al., 2001A&A...378L..17N Binaries discovered by the SPY project. I. Napiwotzki et al., 2002A&A...386..957N Binaries discovered by the SPY project. II.
(End) Patricia Bauer [CDS] 20-Feb-2003
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