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BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field?

Ramsay, Gavin and Howell, Steve B. and Wood, Matt A. and Smale, Alan and Barclay, Thomas and Seebode, Sally A. and Gelino, Dawn and Still, Martin and Cannizzo, John K. (2014) BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field? Monthly Notices of the Royal Astronomical Society, 438 (1). pp. 789-795. ISSN 0035-8711. doi:10.1093/mnras/stt2248.

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BOKS 45906 was found to be a blue source in the Burrell-Optical-Kepler Survey which showed a 3 mag outburst lasting ∼5 d. We present the Kepler light curve of this source which covers nearly 3 years. We find that it is in a faint optical state for approximately half the time and shows a series of outbursts separated by distinct dips in flux. Using data with 1 min sampling, we find clear evidence that in its low state BOKS 45906 shows a flux variability on a period of 56.5574 ± 0.0014 min and a semi-amplitude of ∼3 per cent. Since we can phase all the 1 min cadence data on a common ephemeris using this period, it is probable that 56.56 min is the binary orbital period. Optical spectra of BOKS 45906 show the presence of Balmer lines in emission indicating it is not an AM CVn (pure Helium) binary. Swift data show that it is a weak X-ray source and is weakly detected in the bluest of the UVOT filters. We conclude that BOKS 45906 is a cataclysmic variable with a period shorter than the ‘period-bounce’ systems and therefore BOKS 45906 could be the first helium-rich cataclysmic variable detected in the Kepler field.

Item Type:Article
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URLURL TypeDescription Paper
Ramsay, Gavin0000-0001-8722-9710
Howell, Steve B.0000-0002-2532-2853
Barclay, Thomas0000-0001-7139-2724
Gelino, Dawn0000-0003-1274-2784
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 November 17. Received 2013 November 17; in original form 2013 October 29. First published online: December 13, 2013. Kepler was selected as the 10th mission of the Discovery Program. Funding for this mission is provided by NASA, Science Mission Directorate. The Kepler data presented in this paper were obtained from the Multimission Archive at the Space Telescope Science Institute (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5 26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NAG5 7584 and by other grants and contracts. We acknowledge support via NASA’s Kepler Grants 10-KEPLER10-0013 and 11-KEPLER11-0038. SH, SS and DG wish to thank Carolyn Heffner and Jean Mueller for their help and expertise at the 200 inch Hale Telescope during our observations. Armagh Observatory is supported by the Northern Ireland Government through the Department of Culture Arts and Leisure.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Department of Culture Arts and Leisure (Northern Ireland)UNSPECIFIED
Subject Keywords:binaries: close; stars: dwarf novae; stars: individual: BOKS 45906; novae, cataclysmic variables
Issue or Number:1
Record Number:CaltechAUTHORS:20140227-114106280
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Official Citation:Ramsay, G., Howell, S. B., Wood, M. A., Smale, A., Barclay, T., Seebode, S. A., . . . Cannizzo, J. K. (2014). BOKS 45906: a CV with an orbital period of 56.6 min in the Kepler field? Monthly Notices of the Royal Astronomical Society, 438(1), 789-795.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44036
Deposited By: Jason Perez
Deposited On:27 Feb 2014 21:05
Last Modified:10 Nov 2021 16:46

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