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The AM Canum Venaticorum binary SDSS J173047.59+554518.5

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Carter, P. J., Steeghs, D., Marsh, Tom, Kupfer, T., Copperwheat, Chris M., Groot, Paul J. and Nelemans, Gijs (2014) The AM Canum Venaticorum binary SDSS J173047.59+554518.5. Monthly Notices of the Royal Astronomical Society, Volume 437 (Number 3). pp. 2894-2900. doi:10.1093/mnras/stt2103

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Official URL: http://dx.doi.org/10.1093/mnras/stt2103

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Abstract

The AM Canum Venaticorum (AM CVn) binaries are a rare group of hydrogen-deficient, ultrashort period, mass-transferring white dwarf binaries and are possible progenitors of Type Ia supernovae. We present time-resolved spectroscopy of the recently discovered AM CVn binary SDSS J173047.59+554518.5. The average spectrum shows strong double-peaked helium emission lines, as well as a variety of metal lines, including neon; this is the second detection of neon in an AM CVn binary, after the much brighter system GP Com. We detect no calcium in the accretion disc, a puzzling feature that has been noted in many of the longer period AM CVn binaries. We measure an orbital period, from the radial velocities of the emission lines, of 35.2 ± 0.2 min, confirming the ultracompact binary nature of the system. The emission lines seen in SDSS J1730 are very narrow, although double-peaked, implying a low-inclination, face-on accretion disc; using the measured velocities of the line peaks, we estimate i ≤ 11°. This low inclination makes SDSS J1730 an excellent system for the identification of emission lines.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): White dwarf stars , Double stars, Cataclysmic variable stars , Accretion (Astrophysics)
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 2014
Dates:
DateEvent
2014Published
Volume: Volume 437
Number: Number 3
Page Range: pp. 2894-2900
DOI: 10.1093/mnras/stt2103
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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/I001719/1 (STFC)

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