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Detection of the white dwarf and the secondary star in the new SU UMa dwarf nova HS 2219+1824

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Rodríguez-Gil, P., Gänsicke, B. T. (Boris T.), Hagen, H.-J., Marsh, T. R., Harlaftis, E. T., Kitsionas, S. and Engels, Dieter, 1950-. (2005) Detection of the white dwarf and the secondary star in the new SU UMa dwarf nova HS 2219+1824. Astronomy & Astrophysics, Vol.431 (No.1). pp. 269-277. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20042026

Abstract

We report the discovery of a new, non-eclipsing SU UMa-type dwarf nova, HS 2219+1824. Photometry obtained in quiescence (V ≈ 17.5) reveals a double-humped light curve from which we derive an orbital period of 86.2 min. Additional photometry obtained during a superoutburst reaching V 12.0 clearly shows superhumps with a period of 89.05 min. The optical spectrum contains double-peaked Balmer and He I emission lines from the accretion disc as well as broad absorption troughs of Hβ, Hγ, and Hδ from the white dwarf primary star. Modelling of the optical spectrum implies a white dwarf temperature of 13 000 K < ∼ T eﬀ < ∼ 17 000 K, a distance of 180 pc < ∼ d < ∼ 230 pc, and suggests that the spectral type of the donor star is later than M 5. Phase-resolved spectroscopy obtained during quiescence reveals a narrow Hα emission line component which has a radial velocity amplitude and phase consistent with an origin on the secondary star, possibly on the irradiated hemisphere facing the white dwarf. This constitutes the first detection of line emission from the secondary star in a quiescent SU UMa star.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Dwarf novae
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	February 2005
Volume:	Vol.431
Number:	No.1
Page Range:	pp. 269-277
Identification Number:	10.1051/0004-6361:20042026
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Deutsche Forschungsgemeinschaft (DFG)
Grant number:	Re 353/11 (DFG), Re 353/22 (DFG)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3594