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American Astronomical Society, Astronomical Journal, 5(124), p. 2853-2867, 2002

DOI: 10.1086/343836

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Optical Observations and Orbital Parameters of the Close DA plus [CLC]d[/CLC]M[CLC]e[/CLC] Binaries BPM 71214, EUVE J0720−31.7, BPM 6502, and EC 13471−1258

Journal article published in 2002 by Adela Kawka ORCID, Stéphane Vennes, Rolf Koch, Andrew Williams
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.