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On the Orbital Period Changes of Two Possible Progenitors of Type Ia Supernovae
Shi G(时光)1,2,3; Qian SB(钱声帮)1,2,3
Source PublicationAstronomical Society of the Pacific (ASP) Conference Series - TENTH PACIFIC RIM CONFERENCE ON STELLAR ASTROPHYSICS
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 Univ, Seoul, SOUTH KOREA

In the canonical theory, Type Ia supernovae (SNe Ia) originates from the white dwarf experiencing mass accretion from its companion and nuclear burning, which explodes when the mass reaches the Chandrasekhar mass limit. However, the progenitors of SNe Ia and their physical nature are still unclear. In this work, new CCD photometric observations on V617 Sgr and WX Cen are carried out in order to detect the orbital period change and their secular evolution. For V617 Sgr and WX Cen, the rates of orbital period changes were calculated to be Ṗ = +2.14 × 10-7 day/year and Ṗ = -5.15 × 10-7 day/year. The corresponding timescales of the period changes are ˜ 0.97 × 106 year and ˜ 0.81 × 106 year, respectively. Large variations of orbital periods plausibly indicate the existence of high mass transfer. They are important examples in understanding the mass transfer mechanism in the supersoft X-ray sources. Accordingly, the white dwarfs may evolve into SNe Ia within a million years in the Galaxy. 

Funding OrganizationN/A
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
Publication Place390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA
ISBN978-1-58381-849-7; 978-1-58381-848-0
Archive Date2014-08-25
WOS IDWOS:000374279800036
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordBinaries ; Stars
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Document Type会议论文
Corresponding AuthorShi G(时光)
Affiliation1.Yunnan Astronomical Observatory 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
3.University of the Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Shi G,Qian SB. On the Orbital Period Changes of Two Possible Progenitors of Type Ia Supernovae[C]//Lee, HW; Leung, KC; Kang, YW. 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA:ASTRONOMICAL SOC PACIFIC,2014:207-208.
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