Optical Flares Detected on a Contact Binary: The First Photometric and Spectroscopic Analysis of a Long-period Low Mass Ratio Contact Binary HAT 307-0007476
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866916571604058112 |
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| author | Li, Ling-Zhi Li, Kai Gao, Xiang Chen, Xiao-Dian Feng, Shuai Gao, Dong-Yang Guo, Di-Fu Chen, Xu Gao, Xing Sun, Guo-You Yaqup, Shahidin Bai, Chunhai Esamdin, Ali |
| author_facet | Li, Ling-Zhi Li, Kai Gao, Xiang Chen, Xiao-Dian Feng, Shuai Gao, Dong-Yang Guo, Di-Fu Chen, Xu Gao, Xing Sun, Guo-You Yaqup, Shahidin Bai, Chunhai Esamdin, Ali |
| contents | This paper presents the photometric and spectroscopic analysis of a long-period totally eclipsing contact binary (HAT 307-0007476) for the first time. This system is a low mass ratio ($q\sim0.114$) and medium contact binary ($f\sim37.1\%$). Two flare events were detected in multiple bands observations in December 2022. The interval between the two flare events is 4 days. The average duration of these two flares is about 2289s. Both the two flares achieve the energy levels of superflares. The excess emission of the H$_α$ line in the LAMOST spectra of this object was analyzed, indicating its chromospheric activity. The $O-C$ diagram showed a long-term orbital period increase, which is due to the mass transfer between the two component stars. We conclude that HAT 307-0007476 is currently in a stable region based on both $J_{spin}/J_{orb}$ and the comparison between the instability parameters and its current values. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_10613 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical Flares Detected on a Contact Binary: The First Photometric and Spectroscopic Analysis of a Long-period Low Mass Ratio Contact Binary HAT 307-0007476 Li, Ling-Zhi Li, Kai Gao, Xiang Chen, Xiao-Dian Feng, Shuai Gao, Dong-Yang Guo, Di-Fu Chen, Xu Gao, Xing Sun, Guo-You Yaqup, Shahidin Bai, Chunhai Esamdin, Ali Solar and Stellar Astrophysics This paper presents the photometric and spectroscopic analysis of a long-period totally eclipsing contact binary (HAT 307-0007476) for the first time. This system is a low mass ratio ($q\sim0.114$) and medium contact binary ($f\sim37.1\%$). Two flare events were detected in multiple bands observations in December 2022. The interval between the two flare events is 4 days. The average duration of these two flares is about 2289s. Both the two flares achieve the energy levels of superflares. The excess emission of the H$_α$ line in the LAMOST spectra of this object was analyzed, indicating its chromospheric activity. The $O-C$ diagram showed a long-term orbital period increase, which is due to the mass transfer between the two component stars. We conclude that HAT 307-0007476 is currently in a stable region based on both $J_{spin}/J_{orb}$ and the comparison between the instability parameters and its current values. |
| title | Optical Flares Detected on a Contact Binary: The First Photometric and Spectroscopic Analysis of a Long-period Low Mass Ratio Contact Binary HAT 307-0007476 |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2501.10613 |