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Paper: The Use and the Efficiency of the DDO51 Filter for Identification of Cool White Dwarfs
Volume: 334, 14th European Workshop on White Dwarfs
Page: 119
Authors: Kilic, M.; Winget, D.E.; von Hippel, T.; Claver, C.F.
Abstract: We investigate the use of a narrow-band DDO51 filter for photometric identification of cool white dwarfs. We report photometric observations of 30 known cool white dwarfs with temperatures ranging from 10,000 K down to very cool temperatures (≤ 3500 K). Follow-up spectroscopic observations of a sample of objects selected using this filter and our photometric observations show that DDO51 filter photometry can help select cool white dwarf candidates for follow-up multi-object spectroscopy by rejecting 65% of main sequence stars with the same broad-band colors as the cool white dwarfs. This technique is not selective enough to efficiently feed single-object spectrographs. We present the white dwarf cooling sequence using this filter. Our observations show that very cool white dwarfs form a sequence in the r − DDO vs. r − z color-color diagram and demonstrate that significant improvements are needed in white dwarf model atmospheres.
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