Multi-survey and LDA Techniques for Cool White Dwarf Discovery

Details Multi-survey and LDA Techniques for Cool White Dwarf Discovery Multi-survey and LDA Techniques for Cool White Dwarf Discovery

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734101s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #341.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

We search for new white dwarfs by compiling data from multiple surveys including the Sloan Digital Sky Survey (SDSS), the Two Micron All Sky Survey (2MASS), the Lepine & Shara Proper Motion North (LSPM-North) catalog, and USNO-B catalog. By initially filtering via reduced proper motion diagrams, color cuts, and atmospheric model adherence, white dwarf candidates are isolated for followup spectroscopy. Subdwarf contaminates were observed to persist through the initial filtering process solely in the modeled Teff regime < 7000 K. To mitigate this contamination effect, linear discriminant analysis (LDA) was utilized in further cool white dwarf candidate searches. We present spectroscopy of 17 white dwarfs taken with the CTIO 4m and the APO 3.5m telescopes, while 30 additional white dwarf spectra were found in the SDSS database. These spectra represent a range of spectral types and Teff and serve to investigate the merit of LDA as a tool for contaminant identification and elimination. Our LDA process aided in the discovery of two cool white dwarfs with preliminary distance estimates of 13.6 pc and 15.7 pc.
This research was supported by the 2010 CTIO REU program. Based on observations obtained with the Apache Point Observatory 3.5-meter telescope, which is owned and operated by the Astrophysical Research Consortium.

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