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A Study of Stochastic Low-frequency Variability for Galactic O-type Stars

文献类型：期刊论文

作者Shen, Dong-Xiang1; Zhu, Chun-Hua1; Lu, Guo-Liang1,2; Lu, Xi-zhen1; He, Xiao-long2
刊名ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期2024-11-01
卷号275期号:1页码:2
ISSN号0067-0049
DOI10.3847/1538-4365/ad71d3
产权排序2
英文摘要In order to explore how the ubiquitous stochastic low-frequency (SLF) variability of O-type stars is related to various stellar characteristics, we compiled a sample of 150 O-type stars observed via ground-based spectroscopic surveys, alongside photometric data obtained from the Transiting Exoplanet Survey Satellite (TESS). We analyzed 298 light curves obtained from TESS Sectors 1-65 for the stars in our sample. Leveraging the spectroscopic parameters, we used Bonnsai to determine masses, radii, fractional main-sequence ages, and mass-loss rates for stars of our sample. Subsequently, we identified possible correlations between the fitted parameters of SLF variability and stellar properties. Our analysis unveiled four significant correlations between the amplitude and stellar parameters, including mass, radius, fractional main-sequence ages, and mass-loss rate. For stars with greater than or similar to 30 M circle dot, we observed a decrease in characteristic frequency and steepness with increasing radius. Finally, we compared various physical processes that may account for the SLF variability with our results. The observed SLF variability may arise from the combined effects of the iron convection zone (FeCZ) and internal gravity waves (IGWs), with IGWs potentially more dominant in the early stages of stellar evolution, and the contribution of FeCZ becoming more significant as stars evolve. Meanwhile, our results indicate that the SLF variability of O-type stars bears certain signatures of the line-driven wind instability and granulation.
WOS关键词INTERNAL GRAVITY-WAVES ; ANGULAR-MOMENTUM TRANSPORT ; MAIN-SEQUENCE STARS ; MASSIVE STARS ; SPECTROSCOPIC SURVEY ; MODE-IDENTIFICATION ; HOT STARS ; 3-DIMENSIONAL SIMULATIONS ; OBSERVATIONAL SIGNATURES ; PHOTOMETRIC VARIABILITY
资助项目National Natural Science Foundation of China[U2031204] ; National Natural Science Foundation of China[12163005] ; National Natural Science Foundation of China[12373038] ; National Natural Science Foundation of China[12288102] ; Natural Science Foundation of Xinjiang[2022D01D85] ; Natural Science Foundation of Xinjiang[2022TSYCLJ0006] ; China Manned Space Project[CMS-CSST-2021-A10] ; NASA Explorer Program ; Association of Universities for Research in Astronomy, Inc., under NASA[NAS 5-26555]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001332103300001
出版者IOP Publishing Ltd
资助机构National Natural Science Foundation of China ; Natural Science Foundation of Xinjiang ; China Manned Space Project ; NASA Explorer Program ; Association of Universities for Research in Astronomy, Inc., under NASA
源URL[http://ir.xao.ac.cn/handle/45760611-7/7046]  
专题射电天文研究室_理论天体物理研究团组
通讯作者Zhu, Chun-Hua
作者单位1.Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830046, Peoples R China
2.Chinese Acad Sci, Xinjiang Astron Observ, Natl Astron Observ, Urumqi 830000, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Dong-Xiang,Zhu, Chun-Hua,Lu, Guo-Liang,et al. A Study of Stochastic Low-frequency Variability for Galactic O-type Stars[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2024,275(1):2.
APA Shen, Dong-Xiang,Zhu, Chun-Hua,Lu, Guo-Liang,Lu, Xi-zhen,&He, Xiao-long.(2024).A Study of Stochastic Low-frequency Variability for Galactic O-type Stars.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,275(1),2.
MLA Shen, Dong-Xiang,et al."A Study of Stochastic Low-frequency Variability for Galactic O-type Stars".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 275.1(2024):2.

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来源：新疆天文台

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