A Phenomenological Model for the Light Curve of Three Quiescent Low-inclination Dwarf Novae and One Pre-cataclysmic Variable

被引：7

作者：

Dai, Zhibin ^{[1
,2
,3
,4
,5
]}

Szkody, Paula ^{[6
]}

Kennedy, Mark ^{[7
]}

Su, Jie ^{[1
,2
,4
]}

Medagangoda, N. Indika ^{[8
]}

Robinson, Edward L. ^{[9
]}

Garnavich, Peter M. ^{[10
]}

De Silva, L. Malith M. ^{[11
]}

机构：

[1] Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China

[2] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China

[3] Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China

[4] Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China

[5] Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China

[6] Univ Washington, Seattle, WA 98195 USA

[7] Univ Manchester, Ctr Astrophys, Sch Phys & Astron, Jodrell Bank, Manchester M13 9PL, Lancs, England

[8] Arthur C Clarke Inst Modern Technol, Moratuwa, Sri Lanka

[9] Univ Texas Austin, Austin, TX 78712 USA

[10] Univ Notre Dame, Notre Dame, IN 46556 USA

[11] Sabaragamuwa Univ Sri Lanka, Belihuloya, Sri Lanka

来源：

ASTRONOMICAL JOURNAL | 2018年 / 156卷 / 04期

关键词：

binaries (including multiple): close; novae; cataclysmic variables; white dwarfs; X-RAY BINARIES; ACCRETION DISKS; WHITE-DWARFS; RZ LEONIS; BOLOMETRIC CORRECTIONS; EFFECTIVE TEMPERATURES; Z-CHAMAELEONTIS; MASS-RADIUS; SPACED DATA; HOT-SPOT;

D O I：

10.3847/1538-3881/aadb99

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 WD 1144+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 WD 1144+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 WD 1144+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.

引用

页数：17