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4 papers · 2 filters
The Frequency of Debris Disks at White Dwarfs
Sara D. Barber, Adam J. Patterson, Mukremin Kilic +4
We present near- and mid-infrared photometry and spectroscopy from PAIRITEL, IRTF, and Spitzer of a metallicity-unbiased sample of 117 cool, hydrogen-atmosphere white dwarfs from t…
11-12 Gyr old White Dwarfs 30 parsecs Away
Mukremin Kilic, John R. Thorstensen, P. M. Kowalski +1
We present a detailed model atmosphere analysis of two of the oldest stars known in the solar neighborhood, the high proper motion white dwarfs SDSS J110217.48+411315.4 (hereafter…
The ELM Survey. IV. 24 White Dwarf Merger Systems
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +4
We present new radial velocity and X-ray observations of extremely low-mass (ELM, 0.2 Msol) white dwarf candidates in the Sloan Digital Sky Survey (SDSS) Data Release 7 area. We id…
The Curious Conundrum Regarding Sulfur Abundances In Planetary Nebulae
R. B. C. Henry, A. Speck, A. I. Karakas +2
Sulfur abundances derived from optical emission line measurements and ionization correction factors in planetary nebulae are systematically lower than expected for the objects' met…