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

Adela Kawka; Stéphane Vennes; Rolf Koch; Andrew Williams

doi:10.1086/343836

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

Adela Kawka^*, Stéphane Vennes, Rolf Koch, Andrew Williams

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2853-2867
Number of pages	15
Journal	Astronomical Journal
Volume	124
Issue number	5 1763
DOIs	https://doi.org/10.1086/343836
Publication status	Published - Nov 2002

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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",

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.",

keywords = "Binaries: close, Stars: individual (BPM 71214, EUVE J0720-31.7, BPM 6502, EC 13471-1258), White dwarfs",

author = "Adela Kawka and St{\'e}phane Vennes and Rolf Koch and Andrew Williams",

year = "2002",

month = nov,

doi = "10.1086/343836",

language = "English",

volume = "124",

pages = "2853--2867",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5 1763",

}

TY - JOUR

T1 - Optical observations and orbital parameters of the close DA plus dMe binaries BPM 71214, EUVE J0720-31.7, BPM 6502, and EC 13471-1258

AU - Kawka, Adela

AU - Vennes, Stéphane

AU - Koch, Rolf

AU - Williams, Andrew

PY - 2002/11

Y1 - 2002/11

N2 - 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.

AB - 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.

KW - Binaries: close

KW - Stars: individual (BPM 71214, EUVE J0720-31.7, BPM 6502, EC 13471-1258)

KW - White dwarfs

UR - http://www.scopus.com/inward/record.url?scp=0038246200&partnerID=8YFLogxK

U2 - 10.1086/343836

DO - 10.1086/343836

M3 - Article

SN - 0004-6256

VL - 124

SP - 2853

EP - 2867

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5 1763

ER -

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

Abstract

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