An18.9 min blue large-amplitude pulsator crossing the 'Hertzsprung gap' of hot subdwarfs

被引：24

作者：

Lin, Jie ^{[1
,2
]}

Wu, Chengyuan ^{[1
,2
,17
]}

Wang, Xiaofeng ^{[1
,2
,3
]}

Nemeth, Peter ^{[4
,5
]}

Xiong, Heran ^{[17
,18
]}

Wu, Tao ^{[6
,7
,8
,9
,17
]}

Filippenko, Alexei, V ^{[10
]}

Cai, Yongzhi ^{[1
,2
]}

Brink, Thomas G. ^{[10
]}

Yan, Shengyu ^{[1
,2
]}

Zeng, Xiangyun ^{[11
]}

Luo, Yangping ^{[12
]}

Xiang, Danfeng ^{[1
,2
]}

Zhang, Jujia ^{[17
]}

Zheng, WeiKang ^{[10
]}

Yang, Yi ^{[10
]}

Mo, Jun ^{[1
,2
]}

Xi, Gaobo ^{[1
,2
]}

Zhang, Jicheng ^{[13
]}

Iskandar, Abdusamatjan ^{[14
]}

Esamdin, Ali ^{[14
]}

Jiang, Xiaojun ^{[8
,15
]}

Sai, Hanna ^{[1
,2
]}

Wei, Zixuan ^{[1
,2
]}

Chen, Liyang ^{[1
,2
]}

Guo, Fangzhou ^{[1
,2
]}

Chen, Zhihao ^{[1
,2
]}

Li, Wenxiong ^{[16
]}

Lin, Weili ^{[1
,2
]}

Lin, Han ^{[1
,2
]}

Zhang, Xinghan

机构：

[1] Tsinghua Univ, Phys Dept, Beijing, Peoples R China

[2] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing, Peoples R China

[3] Beijing Acad Sci & Technol, Beijing Planetarium, Beijing, Peoples R China

[4] Czech Acad Sci, Astron Inst, Ondrejov, Czech Republic

[5] Astroserver Org, Malomsok, Hungary

[6] Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming, Yunnan, Peoples R China

[7] Chinese Acad Sci, Ctr Astron Megasci, Beijing, Peoples R China

[8] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing, Peoples R China

[9] Shanxi Univ, Inst Theoret Phys, Taiyuan, Peoples R China

[10] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

[11] China Three Gorges Univ, Ctr Astron & Space Sci, Yichang, Peoples R China

[12] China West Normal Univ, Dept Astron, Nanchong, Peoples R China

[13] Beijing Normal Univ, Dept Astron, Beijing, Peoples R China

[14] Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Peoples R China

[15] Chinese Acad Sci, Natl Astron Observ China, Beijing, Peoples R China

[16] Tel Aviv Univ, Sch Phys & Astron, Tel Aviv, Israel

[17] Chinese Acad Sci, Yunnan Observ, Kunming, Yunnan, Peoples R China

[18] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT, Australia

来源：

NATURE ASTRONOMY | 2023年 / 7卷 / 02期

基金：

美国国家科学基金会; 国家重点研发计划; 中国博士后科学基金; 中国国家自然科学基金;

关键词：

B-STARS; EVOLUTIONARY STATUS; DRIVING MECHANISM;

D O I：

10.1038/s41550-022-01783-z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Blue large-amplitude pulsators (BLAPs) represent a new and rare class of hot pulsating stars with unusually large amplitudes and short periods. The evolutionary path that could give rise to such kinds of stellar configurations is unclear. Here we report a comprehensive study ofthe peculiar BLAP discovered by the Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), namely, TMTSJ035143.63+584,504.2 (TMTS-BLAP-1). This new BLAP has an 18.9 min pulsation period and is similar to the BLAPs with a low surface gravity and extended helium-enriched envelope, suggesting that it is a low-gravity BLAP at the shortest-period end. In particular, the long-term monitoring data reveal that this pulsating star has an unusually large rate of period change, namely, (P) over dot/P = 2.2 x 10(-6) yr(-1). Such a significant and positive value challenges its origins from both helium-core pre-white-dwarfs and core helium-burning subdwarfs, but is consistent with that derived from shell helium-burning subdwarfs. The particular pulsation period and unusual rate of period change indicate that TMTS-BLAP-1 is at a short-lived (similar to 10(6) yr) phase of shell helium ignition before the stable shell helium burning; in other words, TMTS-BLAP-1 is going through a 'Hertzsprung gap' of hot subdwarfs.

引用

页码：223 / +

页数：16

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