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IS WX CEN A POSSIBLE TYPE Ia SUPERNOVA PROGENITOR WITH WIND-DRIVEN MASS TRANSFER?
Qian SB(钱声帮)1,2,3; Shi G(时光)1,2,3; Lajus, EF4,5; Di Sisto, RP4,5; Zhu LY(朱俐颖)1,2,3; Liu L(刘亮)1,2; Zhao EG(赵二刚)1,2; Li LJ(李临甲)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2013-08-01
卷号772期号:2页码:18-
DOI10.1088/2041-8205/772/2/L18
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Wx Cen) Stars: Winds Outflows
摘要WX Cen is one of a few compact binary supersoft X-ray sources (CBSS) in the Galaxy that is a possible Type Ia supernova (SN Ia) progenitor. The supersoft X-ray radiation is explained as hydrostatic nuclear burning on the surface of the white dwarf component that is accreting hydrogen from a stellar companion at a high rate. If the mass donor in this system has a low mass, as has been suggested in the literature, one would expect a high wind-driven mass transfer rate. In that case, the orbital period of the system should increase. To test this theoretical prediction, we have monitored the system photometrically since 2010. By using four newly determined eclipse timings together with those collected from the literature, we discovered that the orbital period is decreasing at a rate of dP/dt = -5.15 x 10(-7) days yr(-1). The long-term decrease in the orbital period is contrary to the prediction that the system is powered by wind-driven accretion. It therefore seems plausible that the mass donor could be more massive than the white dwarf, and that the mass transfer is driven by the thermal instability of the donor star. This finding suggests that WX Cen is a key object to check the physical mechanisms of mass accretion in CBSS. The corresponding timescale of the period change is about P/P. similar to 0.81 x 10(6) yr, indicating that WX Cen may evolve into an SNe Ia within one million years in the Galaxy.
项目资助者Chinese Natural Science Foundation [11133007]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN2041-8205
URL查看原文
归档日期2013-07-12
WOS记录号WOS:000322020000005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]X-RAY BINARIES ; V-SAGITTAE ; STARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5883
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Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, P.R. China
2.Key Laboratory of the Structure and Evolution Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China
3.Graduate University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, P. R. China
4.Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina
5.Instituto de Astrofisica de La Plata (CCT La plata-CONICET/UNLP), La Plata, Argentina
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Qian SB,Shi G,Lajus, EF,et al. IS WX CEN A POSSIBLE TYPE Ia SUPERNOVA PROGENITOR WITH WIND-DRIVEN MASS TRANSFER?[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,772(2):18-.
APA Qian SB.,Shi G.,Lajus, EF.,Di Sisto, RP.,Zhu LY.,...&Qian, SB .(2013).IS WX CEN A POSSIBLE TYPE Ia SUPERNOVA PROGENITOR WITH WIND-DRIVEN MASS TRANSFER?.ASTROPHYSICAL JOURNAL LETTERS,772(2),18-.
MLA Qian SB,et al."IS WX CEN A POSSIBLE TYPE Ia SUPERNOVA PROGENITOR WITH WIND-DRIVEN MASS TRANSFER?".ASTROPHYSICAL JOURNAL LETTERS 772.2(2013):18-.
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