Evalyn Gates - Storming Media

A Detailed Model Atmosphere Analysis of Cool White Dwarfs in the Sloan Digital Sky Survey

Sep 2010

24 pages

Authors: Mukremin Kilic; S K Leggett; P E von Tremblay; Ted Hippel; P Bergeron; Hugh C Harris; Jeffrey A Munn; Kurtis A Williams; Evalyn Gates; J Farihi; NAVAL OBSERVATORY FLAGSTAFF AZ

The full text of this report is available for sale.

We present optical spectroscopy and near-infrared photometry of 126 cool white dwarfs (WDs) in the Sloan Digital Sky Survey (SDSS). Our sample includes high proper motion targets selected using the SDSS and USNO-B astrometry and a dozen previously known ultracool WD candidates. Our optical spectroscopic observations demonstrate that a clean selection of large samples of cool WDs in the SDSS (and the SkyMapper, Pan-STARRS, and the Large Synoptic Survey Telescope ...

A Nearby Old Halo White Dwarf Candidate from the Sloan Digital Sky Survey

Jul-2008

8 pages

Authors: Patrick B Hall; Piotr M Kowalski; Hugh C Harris; Akshay Awal; S K Leggett; Mukremin Kilic; Scott F Anderson; Evalyn Gates; NAVAL OBSERVATORY WASHINGTON DC

We report the discovery of a nearby old halo white dwarf (WD) candidate from the Sloan Digital Sky Survey (SDSS). SDSS J110217.48+411315.4 has a proper motion of 1'.75 yr-1 and redder optical colors than all other known featureless (type DC) WDs. We present SDSS imaging and spectroscopy of this object, along with near-infrared photometry obtained at the United Kingdom Infrared Telescope (UKIRT). Fitting its photometry with up-to-date model atmospheres, we ...