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| A Study of Stochastic Low-frequency Variability for Galactic O-type Stars | |
Shen, Dong-Xiang1; Zhu, Chun-Hua1; Lu, Guo-Liang1,2 ; Lu, Xi-zhen1; He, Xiao-long2
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| 2024-11-01 | |
| Source Publication | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
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| ISSN | 0067-0049 |
| Volume | 275Issue:1Pages:2 |
| Contribution Rank | 2 |
| Abstract | 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. |
| DOI | 10.3847/1538-4365/ad71d3 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | INTERNAL GRAVITY-WAVES ; ANGULAR-MOMENTUM TRANSPORT ; MAIN-SEQUENCE STARS ; MASSIVE STARS ; SPECTROSCOPIC SURVEY ; MODE-IDENTIFICATION ; HOT STARS ; 3-DIMENSIONAL SIMULATIONS ; OBSERVATIONAL SIGNATURES ; PHOTOMETRIC VARIABILITY |
| Funding Project | 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 Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:001332103300001 |
| Publisher | IOP Publishing Ltd |
| Funding Organization | 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 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/7047 |
| Collection | 射电天文研究室_理论天体物理研究团组 |
| Corresponding Author | Zhu, Chun-Hua |
| Affiliation | 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 |
| Recommended Citation 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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| Shen-2024-A Study of（2741KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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