期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 452, 期 1, 页码 146-157出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1244
关键词
binaries: close; stars: fundamental parameters; stars: individual: HS 0220+0603; novae, cataclysmic variables
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) [AYA2012-38700, AYA2010-18080]
- MINECO under Ramon y Cajal programme [RYC-2010-05762]
- XMM [NNG05GJ22G]
- UK's Science and Technology Facilities Council [ST/L000733/1]
- European Research Council under European Union [320964]
- FONDECYT [1141269]
- Millennium Nucleus (Chilean Ministry of Economy) [RC130007]
- STFC
- European Organization for Astronomical Research in the Southern hemisphere, Chile [074.D-0657]
- ESA Member States
- NASA
- STFC [ST/M001350/1, ST/L000733/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M001350/1, ST/L000733/1] Funding Source: researchfish
We present the first dynamical determination of the binary parameters of an eclipsing SW Sextantis star in the 3-4 h orbital period range during a low state. We obtained time-resolved optical spectroscopy and photometry of HS 0220+0603 during its 2004-2005 low-brightness state, as revealed in the combined Small & Moderate Aperture Research Telescope System, IAC80 and M1 Group long-term optical light curve. The optical spectra taken during primary eclipse reveal a secondary star spectral type of M5.5 +/- 0.5 as derived from molecular bandhead indices. The spectra also provide the first detection of a DAB white dwarf in a cataclysmic variable. By modelling its optical spectrum we estimate a white dwarf temperature of 30 000 +/- 5000 K. By combining the results of modelling the white dwarf eclipse from ULTRACAM light curves with those obtained by simultaneously fitting the emission-and absorption-line radial velocity curves and I-band ellipsoidal light curves, we measure the stellar masses to be M-1 = 0.87 +/- 0.09 M-circle dot and M-2 = 0.47 +/- 0.05 M-circle dot for the white dwarf and the M dwarf, respectively, and an inclination of the orbital plane of i approximate to 79 degrees. A radius of 0.0103 +/- 0.0007 R-circle dot is obtained for the white dwarf. The secondary star in HS 0220+0603 is likely too cool and undersized for its mass.
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