The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics

@article{Sion2009TheWD,
  title={The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics},
  author={Edward M. Sion and Jay B. Holberg and Terry D. Oswalt and G. P. Mccook and Richard P. Wasatonic},
  journal={The Astronomical Journal},
  year={2009},
  volume={138},
  pages={1681-1689}
}
We present the kinematical properties, distribution of spectroscopic subtypes, and stellar population subcomponents of the white dwarfs within 20 pc of the Sun. We find no convincing evidence of halo white dwarfs in the total 20 pc sample of 129 white dwarfs nor is there convincing evidence of genuine thick disk subcomponent members within 20 parsecs. Virtually, the entire 20 pc sample likely belongs to the thin disk. The total DA to non-DA ratio of the 20 pc sample is 1.6, a manifestation of… Expand

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References

SHOWING 1-10 OF 38 REFERENCES
A determination of the local density of white dwarf stars
The most recent version of the Catalog of Spectroscopically Identified White Dwarfs lists 2249 white dwarf stars. Among these stars are 109 white dwarfs that have either reliable trigonometricExpand
The Parentage of Magnetic White Dwarfs: Implications from Their Space Motions
We have examined the statistical properties, cooling ages, and vector components of the three‐dimensional space motion U, V, W for the enlarged sample of 53 magnetic white dwarfs contained in theExpand
A NEW LOOK AT THE LOCAL WHITE DWARF POPULATION
We have conducted a detailed new survey of the local population of white dwarfs lying within 20 pc of the Sun. A new revised catalog of local white dwarfs containing 122 entries (126 individualExpand
Wide Binary Systems and the Nature of High-Velocity White Dwarfs
We present measured radial velocities and complete space motions for 116 white dwarf stars with M dwarf companions. Thirteen pairs have "halo-like" velocities. According to a recent study byExpand
3D kinematics of white dwarfs from the SPY project
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 haloExpand
Limits on the Halo White Dwarf Component of Baryonic Dark Matter from the Hubble Deep Field
The MACHO collaboration lensing event statistics suggest that a significant fraction of the dark Galactic halo can be comprised of baryonic matter in the form of white dwarf stars with masses betweenExpand
A lower limit of 9.5 Gyr on the age of the Galactic disk from the oldest white dwarf stars
WHITE dwarf stars represent the final evolutionary state for most main-sequence stars. They cool slowly enough that even the oldest white dwarfs are still observable in sufficiently deep surveys andExpand
Spectroscopic Identification of Cool White Dwarfs in the Solar Neighborhood
The New Luyten Two-Tenths catalog contains a large number of high proper motion white dwarf candidates that remain to be spectroscopically confirmed. We present new spectroscopic observations, asExpand
Detailed Spectroscopic and Photometric Analysis of DQ White Dwarfs
We present an analysis of spectroscopic and photometric observations of cool DQ white dwarfs based on improved model atmosphere calculations. In particular, we revise the atmospheric parameters ofExpand
INFRARED SIGNATURES OF DISRUPTED MINOR PLANETS AT WHITE DWARFS
Spitzer Space Observatory IRAC and MIPS photometric observations are presented for 20 white dwarfs with T eff 20, 000 K and metal-contaminated photospheres. A warm circumstellar disk is detected atExpand
...
1
2
3
4
...