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Dark-Spot Activity on the Secondary as the Origin of Variable Mass Accretion in Cataclysmic Variables
Qian SB(钱声帮)1,2,3; Zhu LY(朱俐颖)1,2,3; Fernandez Lajus, E.4,5; He JJ(何家佳)1,2; Liao WP(廖文萍)1,2; Zhao EG(赵二刚)1,2; Liu L(刘亮)1,2; Yang YG(杨远贵)6
Source PublicationAstronomical Society of the Pacific (ASP) Conference Series - TENTH PACIFIC RIM CONFERENCE ON STELLAR ASTROPHYSICS
2014-08
Volume482
Pages171-176
Author of SourceLee, HW; Leung, KC; Kang, YW
Contribution Rank第1完成单位
Indexed ByCPCI
Conference Name10th Pacific Rim Conference on Stellar Astrophysics
Conference Date2013-05-27
Conference PlaceSejong University Convention Center, Seoul, Korea
Abstract

In magnetic CVs (polars), the magnetic fields of the white dwarfs are strong enough to prevent materials from the main-sequence companions for forming an accretion disc. Therefore, polars especially eclipsing polars provide a good chance to study mass accretion directly. In the past 4 years, we have monitored several eclipsing polars (e.g., DP Leo and HU Aqr) by using the 2.4-m and 1.0-m telescopes in China and the 2.15-m telescope in Argentina. Nearly 100 eclipse profiles were obtained. In this talk, apart from the detection of a few giant planets orbiting polars, I will summarize some other progresses of our research group at Yunnan Observatories. Our results are as following: (1) the correlation between the out-of-eclipse brightness variation and the change of the eclipse profile suggests that both the accretion hot spot and the accretion stream brighten and become faint instantaneously. This is the direct evidence of variable mass transfer in a CV that is also supported by the relation between the out-of-eclipse brightness and the depth of eclipse. (2) We find the brightness state change is correlated with the dark-spot activity near the L1 point. The low state usually corresponds to the presence of a large spot at L1point, while the dark spot disappear at a high state indicating that it is the dark-spot activity caused the mass transfer in CVs. (3) Magnetic activity cycles of the cool secondary did not correlate with the brightness state change revealing the variable mass accretion was not caused by magnetic activity cycles.

Funding ProjectChinese Natural Science Foundation through a key project[11133007]
Funding OrganizationN/AChinese Natural Science Foundation through a key project
Language英语
Subject Area天文学 ; 天体物理学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeProceedings Paper
PublisherAstronomical Society of the Pacific
Publication Place390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA
ISBN978-1-58381-849-7; 978-1-58381-848-0
URL查看原文
Archive Date2014-08-25
WOS IDWOS:000374279800029
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordAm-herculis ; Hu Aqr
Citation statistics
Document Type会议论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9643
Collection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
Corresponding AuthorQian SB(钱声帮)
Affiliation1.Yunnan Observatories, Chinese Academy of Science, P. O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
3.Graduate University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing City, China
4.Facultad de Ciencias Astron´omicas y Geof´ısicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
5.Instituto de Astrofisica de La Plata (CCT La plata - CONICET/UNLP), Argentina
6.School of Physics and Electronic Information, Huaibei Normal University, 235000 Huaibei, Anhui Province, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Zhu LY,Fernandez Lajus, E.,et al. Dark-Spot Activity on the Secondary as the Origin of Variable Mass Accretion in Cataclysmic Variables[C]//Lee, HW; Leung, KC; Kang, YW. 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA:Astronomical Society of the Pacific,2014:171-176.
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