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Long-term photometric behavior of the eclipsing Z Cam-type dwarf nova AY Psc
Han ZT(韩忠涛)1,2,3; Qian SB(钱声帮)1,2,3; Voloshina, Irina4; Zhu LY(朱俐颖)1,2,3; Han, Zhong-Tao(Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China)
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2017-06-01
卷号17期号:6页码:56-65
DOI10.1088/1674-4527/17/6/56
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Stars: Cataclysmic Variables Stars: Individual (Ay Psc)
摘要New eclipse timings of the Z Cam-type dwarf nova AY Psc were measured and the orbital ephemeris was revised. In addition, based on long-term AAVSO data, the outburst behaviors were also explored. Our analysis suggests that normal outbursts are quasi-periodic, with an amplitude of similar to 2.5 (+/- 0.1) mag and a period of similar to 18.3 (+/- 0.7) d. The amplitude vs. recurrence-time relation of AY Psc is discussed, and we conclude that this relationmay represent general properties of dwarf nova outbursts. The observed standstill ends with an outburst, which is inconsistent with the general picture of Z Camtype stars. This unusual behavior was considered to be related to mass- transfer outbursts. Moreover, the average luminosity is brighter during standstills than during outburst cycles. The changes in brightness mark variations in. M (over dot)(2) due to the fact that the disk of AY Psc is nearly steady state. M (over dot)(2) value was limited to the range from 6.35 x 10(-9) to 1.18 x 10(-8) M circle dot yr(-1). More detailed examination shows that there are a few small outbursts present during standstills. These events with amplitudes of similar to 0.5-0.9 mag are very similar to the stunted outbursts reported in some nova-like cataclysmic variables. We discussed several possible mechanisms and suggested that the most reasonable mechanism for these stunted outbursts is a changing mass- transfer rate.
项目资助者National Natural Science Foundation of China(11325315, 11611530685, 11573063, 11133007) ; Strategic Priority Research Program "The Emergence of Cosmological Structure" of the Chinese Academy of Sciences(XDB09010202) ; Science Foundation of Yunnan Province(2012HC011) ; Russian Foundation for Basic Research(17-52-53200)
语种英语
学科领域天文学
文章类型Article
ISSN1674-4527
URL查看原文
归档日期2017-06-28
WOS记录号WOS:000408362700008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CATACLYSMIC VARIABLES ; STUNTED OUTBURSTS ; Z-CAMELOPARDALIS ; PG 0134+070 ; OLD NOVAE ; MODEL ; PISCIUM ; US-943 ; ALPHA ; STARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11899
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Han, Zhong-Tao(Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Sternberg Astronomical Institute, Moscow State University, Universitetskij prospect 13, Moscow 119992, Russia
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Han ZT,Qian SB,Voloshina, Irina,et al. Long-term photometric behavior of the eclipsing Z Cam-type dwarf nova AY Psc[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(6):56-65.
APA Han ZT,Qian SB,Voloshina, Irina,Zhu LY,&Han, Zhong-Tao.(2017).Long-term photometric behavior of the eclipsing Z Cam-type dwarf nova AY Psc.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(6),56-65.
MLA Han ZT,et al."Long-term photometric behavior of the eclipsing Z Cam-type dwarf nova AY Psc".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.6(2017):56-65.
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