AX UMa, an ab-type RR Lyrae Star with a Rapidly Decreasing Pulsation Period, and Its Binarity
文献类型:期刊论文
作者 | Li LJ(李临甲)1,2,3; Qian SB(钱声帮)1,2,3,4; Zhu LY(朱俐颖)1,2,3,4; He JJ(何家佳)1,2,3; Fang, X.-H.1,2,3,4 |
刊名 | The Astronomical Journal |
出版日期 | 2021-03-23 |
卷号 | 161期号:4页码:14 |
ISSN号 | 0004-6256 |
关键词 | Sky surveys RR Lyrae variable stars Binary stars CCD observation |
DOI | 10.3847/1538-3881/abe4df |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | The pulsation periods of RR Lyrae stars usually vary with time, and they are often used as probes to study the mechanism behind the variation. After the early discovery that the pulsation period of the RR Lyrae star AX UMa decreased rapidly, in further research, we made multiband photometric observations of this star using the Sino-Thai 70 cm telescope and the 60 cm telescope at Yunnan Observatories, and collected its light-curve data from several photometry sky surveys. The O–C diagram confirmed that AX UMa has a rapid period decrease with a rate of ?7.752 ± 0.005 days Myr?1, which indicates that it is the fastest-period decreasing ab-type RR Lyrae star in the Galactic field. Moreover, the O – C residuals contain additional periodic variations. We suppose that the variation with a long period is probably caused by the light-travel time effect as the star orbits in a binary system. The calculation shows that the lower mass limit of the companion is about 1 M⊙. Combined with the full amplitudes and color indexes, we suggested that the companion is probably a hot subdwarf star. We compared the light curves of AX UMa and those of another binary evolution pulsator, OGLE-BLG-RRLYR-02792, and found that the former shows the characteristics of ab-type RR Lyrae stars, while the latter is more like an extreme long-period c-type RR Lyrae star. However, the absence of a bump in the light curves implies that the mass loss has occurred in the outer atmosphere of AX UMa. The special features of AX UMa make it worth more attention and further observations. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | NSF[AST-0407380] ; NSF[AST-0909073] ; NSF[AST-1313370] ; National Natural Science Foundation of China[11803084] ; National Natural Science Foundation of China[11933008] ; National Natural Science Foundation of China[11922306] ; CAS Interdisciplinary Innovation Team |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000632554700001 |
资助机构 | NSF[AST-0407380, AST-0909073, AST-1313370] ; National Natural Science Foundation of China[11803084, 11933008, 11922306] ; CAS Interdisciplinary Innovation Team |
源URL | [http://ir.ynao.ac.cn/handle/114a53/24224] |
专题 | 云南天文台_双星与变星研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Li LJ(李临甲) |
作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650216, People's Republic of China 2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650216, People's Republic of China 3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China 4.University of Chinese Academy of Sciences, 100049 Beijing, China/Yuquan Road 19#, Sijingshang Block, Beijing, 100049, People's Republic of China |
推荐引用方式 GB/T 7714 | Li LJ,Qian SB,Zhu LY,et al. AX UMa, an ab-type RR Lyrae Star with a Rapidly Decreasing Pulsation Period, and Its Binarity[J]. The Astronomical Journal,2021,161(4):14. |
APA | Li LJ,Qian SB,Zhu LY,He JJ,&Fang, X.-H..(2021).AX UMa, an ab-type RR Lyrae Star with a Rapidly Decreasing Pulsation Period, and Its Binarity.The Astronomical Journal,161(4),14. |
MLA | Li LJ,et al."AX UMa, an ab-type RR Lyrae Star with a Rapidly Decreasing Pulsation Period, and Its Binarity".The Astronomical Journal 161.4(2021):14. |
入库方式: OAI收割
来源:云南天文台
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