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The helium-rich cataclysmic variable SBSS 1108+574
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Carter, P. J., Steeghs, D., de Miguel, E., Goff, W., Koff, R. A., Krajci, T., Marsh, Tom, Gänsicke, B. T. (Boris T.), Breedt, E., Groot, P. J., Nelemans, G., Roelofs, G. H. A., Rau, Arne, Koester, Detlev and Kupfer, T. (2013) The helium-rich cataclysmic variable SBSS 1108+574. Monthly Notices of the Royal Astronomical Society, Volume 431 (Number 1). pp. 372-382. doi:10.1093/mnras/stt169 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt169
Abstract
We present time-resolved spectroscopy and photometry of the dwarf nova SBSS 1108+574, obtained during the 2012 outburst. Its quiescent spectrum is unusually rich in helium, showing broad, double-peaked emission lines from the accretion disc. We measure a line flux ratio He I 5875/Hα = 0.81 ± 0.04, a much higher ratio than typically observed in cataclysmic variable stars (CVs). The outburst spectrum shows hydrogen and helium in absorption, with weak emission of Hα and He I 6678, as well as strong He II emission.
From our photometry, we find the superhump period to be 56.34 ± 0.18 min, in agreement with the previously published result. The spectroscopic period, derived from the radial velocities of the emission lines, is found to be 55.3 ± 0.8 min, consistent with a previously identified photometric orbital period, and significantly below the normal CV period minimum. This indicates that the donor in SBSS 1108+574 is highly evolved. The superhump excess derived from our photometry implies a mass ratio of q = 0.086 ± 0.014. Our spectroscopy reveals a grazing eclipse of the large outbursting disc. As the disc is significantly larger during outburst, it is unlikely that an eclipse will be detectable in quiescence. The relatively high accretion rate implied by the detection of outbursts, together with the large mass ratio, suggests that SBSS 1108+574 is still evolving towards its period minimum.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Accretion (Astrophysics), Double stars, Cataclysmic variable stars, White dwarf stars | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Oxford University Press | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 1 May 2013 | ||||
Dates: |
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Volume: | Volume 431 | ||||
Number: | Number 1 | ||||
Page Range: | pp. 372-382 | ||||
DOI: | 10.1093/mnras/stt169 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Date of first compliant deposit: | 24 December 2015 | ||||
Date of first compliant Open Access: | 24 December 2015 | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Netherlands Research School for Astronomy (NOVA), Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO) | ||||
Grant number: | ST/F002599/1 (STFC) |
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