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Optical observations and orbital parameters of the close DA plus dMe binaries BPM 71214, EUVE J0720-31.7, BPM 6502, and EC 13471-1258

Kawka, A., Vennes, S., Koch, R. and Williams, A. (2002) Optical observations and orbital parameters of the close DA plus dMe binaries BPM 71214, EUVE J0720-31.7, BPM 6502, and EC 13471-1258. The Astronomical Journal, 124 (5). pp. 2853-2867.

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Abstract

We have obtained photometric and spectroscopic observations of the close DA plus dMe binaries BPM 6502 and EC 13471-1258, and spectroscopic observations of the close binaries BPM 71214 and EUVE J0720-31.7. We have updated the ephemerides of BPM 6502 and EUVE J0720-31.7 with the spectroscopic measurements and obtained periods of 0.20162 and 0.15074 days for BPM 71214 and EC 13471-1258, respectively, by measuring the shift in Hα emission. Photometric variations in R and I due to reprocessing of incoming radiation from the hot white dwarf were observed in BPM 6502. We have also observed eclipses and ellipsoidal variations in B and R for EC 13471-1258, suggesting that the secondary is nearly filling its Roche lobe.

Item Type: Journal Article
Publisher: Institute of Physics
URI: http://researchrepository.murdoch.edu.au/id/eprint/33991
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