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  • 标题:A Phenomenological Model for the Light Curve of Three Quiescent Low-inclination Dwarf Novae and One Pre-cataclysmic Variable
  • 本地全文:下载
  • 作者:Zhibin Dai ; Paula Szkody ; Mark Kennedy
  • 期刊名称:The Astronomical journal
  • 印刷版ISSN:0004-6256
  • 电子版ISSN:1538-3881
  • 出版年度:2018
  • 卷号:156
  • 期号:4
  • 页码:1-17
  • DOI:10.3847/1538-3881/aadb99
  • 语种:English
  • 出版社:American Institute of Physics
  • 摘要:We used the light curve code XRBinary to model the quiescent K2 light curves of three low-inclination cataclysmic variables (CVs):1RXS J0632+2536 (J0632+2536), RZ Leo, TW Vir and the pre-CV WD1144+011. Optimized light curve models were obtained using a nonlinear fitting code NMfit and visualized by Phoebe 2.0. The disk model of J0632+2536 shows that one hotspot at the edge of the disk is enough to describe its light curve, while the other two dwarf nova (DN):RZ Leo and TW Vir require two hotspots. A typical pre-CV model with a weak irradiation effect for WD1144+011 can explain its single-hump modulation and the newly observed spectrum confirms its previous classification. The synthetic analyses for the DN clearly indicate that phase zero of the double-hump modulations occurs around the secondary minimum and the primary hump is mainly caused by the hotspot at the edge of the disk. The quiescent disk has a flat temperature distribution with a power index of ∼0.11. The disk model of RZ Leo implies a truncated disk, supporting its previously speculated classification as an intermediate polar (IP). Except for the IP model of RZ Leo, which lacks a component related to the inferred accretion curtain, the models of J0632+2536, TW Vir and WD1144+011 are consistent with results from the Gaia mission. The derived masses and radii of the secondaries of the three DN are consistent with the semi-empirical relations for CV donor stars, while their effective temperatures are higher than the predictions. Irradiation of the donor stars is investigated to explain this discrepancy.
  • 关键词:binaries (including multiple): close;novae, cataclysmic variables;white dwarfs
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