# White Dwarf-Red Dwarf Systems Resolved with the Hubble Space Telescope. I. First Results

@article{Farihi2006WhiteDD,
title={White Dwarf-Red Dwarf Systems Resolved with the Hubble Space Telescope. I. First Results},
author={Jay Farihi and Donald Wayne Hoard and Stefanie Wachter},
journal={The Astrophysical Journal},
year={2006},
volume={646},
pages={480-492}
}
• Published 2006
• Physics
• The Astrophysical Journal
First results are presented for a Hubble Space Telescope (HST) Advanced Camera for Surveys snapshot study of white dwarfs with likely red dwarf companions. Of 48 targets observed and analyzed so far, 27 are totally or partially resolved into two or more components, while an additional 15 systems are almost certainly unresolved binaries. These results provide the first direct empirical evidence for a bimodal distribution of orbital separations among binary systems containing at least one white… Expand

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#### References

SHOWING 1-10 OF 92 REFERENCES
A First Look at White Dwarf-M Dwarf Pairs in the Sloan Digital Sky Survey
We have identified 109 white dwarf (WD)–M dwarf pairs in the Sloan Digital Sky Survey (SDSS) with g < 20th magnitude. For each system we determined the temperature of the WD primary and the spectralExpand
AN X-RAY SELECTED WHITE DWARF + M DWARF BINARY: RX J0458.9-6628
• Physics
• 1995
A new close binary containing a DA white dwarf and a dwarf M star has been identified from its X-ray emission. The spectra of both stars are seen with about equal flux at ~4600A. H and Ca IIExpand
Wide Binary Systems and the Nature of High-Velocity White Dwarfs
• Physics
• 2002
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
An Archive of IUE Low-Dispersion Spectra of the White Dwarf Stars
• Physics
• 2003
We have produced an archive of the ultraviolet low-dispersion spectra for the full set of white dwarf stars observed with the International Ultraviolet Explorer (IUE) satellite over the course of itsExpand
Companions to white dwarfs : very low-mass stars and the brown dwarf candidate GD 165B
• Physics
• 1992
We estimate the initial mass function (IMF) for star formation at the bottom of the main sequence by measuring the number of low-luminosity companions to white dwarfs. A histogram of the number ofExpand
Detection of a new white-dwarf binary system in the extreme ultraviolet using the Rosat Wide Field Camera
DETAILED understanding of the evolution of main-sequence stars into white dwarfs depends on knowledge of the chemical composition of white-dwarf atmospheres, but the hottest white dwarfs emit much ofExpand
Cool Companions to White Dwarfs from the Two Micron All-Sky Survey Second Incremental Data Release
We present near-infrared (IR) magnitudes for all white dwarfs (selected from the catalog of McCook & Sion) contained in the Two Micron All-Sky Survey second incremental data release (2MASS 2IDR). WeExpand
A search for brown dwarfs and late M dwarfs in the Hyades and the Pleiades
• Physics
• 1987
The J and K colors of 14 white dwarfs that are believed to be single stars and members of either the Hyades or Pleiades clusters or the Hyades supercluster were measured, and no indication of anyExpand
High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia progenitor survey (SPY). I. ?;??
We have started a large survey for radial velocity variations in white dwarfs (PI R. Napiwotzki) with the aim of nding close double degenerates, which could be precursor systems for SNe Ia. The UVESExpand
WHITE DWARFS FROM THE HAMBURG SCHMIDT SURVEY
• Physics
• 1993
A status report on follow-up spectroscopy of hot evolved stars discovered by the Hamburg Schmidt survey is given. A few stars of particular interest are highlighted: PG0824+289 (=HS0824+2854) isExpand