A Multi-Survey Approach to White Dwarf Discovery
NAVAL OBSERVATORY FLAGSTAFF AZ
Pagination or Media Count:
By selecting astrometric and photometric data from the Sloan Digital Sky Survey SDSS, the Lepine Shara Proper Motion North Catalog LSPM-North, the Two Micron All Sky Survey 2MASS, and the USNO-B1.0 catalog, we use a succession of methods to isolate white dwarf WD candidates for follow-up spectroscopy. Our methods include reduced proper motion diagram cuts, color cuts, and atmospheric model adherence. We present spectroscopy of 26WDs obtained from the CTIO 4 m and APO 3.5 m telescopes. Additionally, we confirm 28WDs with spectra available in the SDSS DR7 database but unpublished elsewhere, presenting a total of 54 WDs. We label one of these as a recovered WD while the remaining 53 are new discoveries. We determine physical parameters and estimate distances based on atmospheric model analyses. Three new WDs are modeled to lie within 25 pc. Two additional WDs are confirmed to be metal-polluted DAZ. Follow-up time series photometry confirms another object to be a pulsating ZZ Ceti WD.