The relative contributions to the near-infrared emission in short-period cataclysmic variables

被引:56
作者
Ciardi, DR [1 ]
Howell, SB
Hauschildt, PH
Allard, F
机构
[1] Univ Wyoming, Dept Phys & Astron, Wyoming Infrared Observ, Laramie, WY 82071 USA
[2] Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA
[3] Univ Georgia, Ctr Simulat Phys, Athens, GA 30602 USA
[4] Wichita State Univ, Dept Phys, Wichita, KS USA
关键词
binaries : close; infrared : stars; novae; cataclysmic variables;
D O I
10.1086/306081
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present phase-resolved near-infrared broadband photometry of four short-period cataclysmic variables (HU Aqr, WZ Sge, TY Psc, and V592 Gas). Coupled with ultraviolet and optical data obtained from the literature, we have modeled the spectral energy distributions of these four cataclysmic variables, as well as that of the twin of WZ Sge, AL Com. The secondary stars contribute no more than 20%-50% of the near-infrared flux except for the polar HU Aqr, where the secondary contributes similar to 75% of the near-infrared flux. For the systems located above the orbital period minimum, the temperatures of the secondary stars match those for the expected main-sequence secondary stars. However, our modeling places WZ Sge below the orbital period minimum and shows it containing a secondary star of less than 1700 K-the coldest "star" yet identified.
引用
收藏
页码:450 / 460
页数:11
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