Journal article
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, Vol.124(5), pp.2853-2867
2002
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.
Details
- Title
- Optical observations and orbital parameters of the close DA plus dMe binaries BPM 71214, EUVE J0720-31.7, BPM 6502, and EC 13471-1258
- Authors/Creators
- A. Kawka (Author/Creator)S. Vennes (Author/Creator)R. Koch (Author/Creator)A. Williams (Author/Creator)
- Publication Details
- The Astronomical Journal, Vol.124(5), pp.2853-2867
- Publisher
- Institute of Physics
- Identifiers
- 991005541875707891
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- 5 Physics
- 5.20 Astronomy & Astrophysics
- 5.20.17 Stellar Evolution
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- Astronomy & Astrophysics
- ESI research areas
- Space Science