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The Discovery of Binary White Dwarfs that will Merge within 500 Myr
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +2
We present radial velocity observations of four extremely low-mass (0.2 Msol) white dwarfs. All four stars show peak-to-peak radial velocity variations of 540 - 710 km/s with 1.0 -…
Velocity Dispersion Profile of the Milky Way Halo
Warren R. Brown, Margaret J. Geller, Scott J. Kenyon +1
We present a spectroscopic sample of 910 distant halo stars from the Hypervelocity Star survey from which we derive the velocity dispersion profile of the Milky Way halo. The sampl…
Runaway Stars, Hypervelocity Stars, and Radial Velocity Surveys
Benjamin C. Bromley, Scott J. Kenyon, Warren R. Brown +1
Runaway stars ejected from the Galactic disk populate the halo of the Milky Way. To predict the spatial and kinematic properties of runaways, we inject stars into a Galactic potent…
The Runaway White Dwarf LP400-22 Has a Companion
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +4
We report the detection of a radial velocity companion to the extremely low mass white dwarf LP400-22. The radial velocity of the white dwarf shows variations with a semi-amplitude…