TIC 308396022: delta Scuti-gamma Doradus hybrid with large-amplitude radial fundamental mode and regular g-mode period spacing
TIC 308396022: delta Scuti-gamma Doradus hybrid with large-amplitude radial fundamental mode and regular g-mode period spacing
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DOI：
10.1051/0004-6361/202142198
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发表时间：
2021-10
影响因子：
6.5
通讯作者：
Tao Yang;Z. Zuo;Gang Li;T. J. I. F. Astronomy;S. O. Physics;U. Sydney;Stellar Astrophysics Centre;D. Physics;Astronomy;Aarhus University;S. P. I. F. Astronomy;M. Joyce
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作者：
Tao Yang;Z. Zuo;Gang Li;T. J. I. F. Astronomy;S. O. Physics;U. Sydney;Stellar Astrophysics Centre;D. Physics;Astronomy;Aarhus University;S. P. I. F. Astronomy;M. Joyce
我们分析了TESS使命观测到的TIC 308396022的脉动行为。这颗星星是一颗高振幅δSct星星（HADS），在3年光变曲线上显示出非常丰富的振幅谱。在这些频率中，最强的峰f1 = 13.20362567（12）d−1被确定为径向基模，我们还发现了第一和第二泛音（f2和f3）。在低频范围（< 2.5 d-1），22个峰值被识别为重力模式，其显示出约2460 s的规则周期间隔，并且具有角度l = 1。周期间隔模式没有显示出明显的下降趋势，表明星星旋转缓慢。我们注意到这是一颗δSct-γDor混合星星，包含高振幅径向基模和规则g模周期间隔图案。通过O-C分析，我们发现该星星具有明显的时间延迟，这意味着该星星有一颗伴星，伴星很可能是一颗白色矮星。可能的质量传递的历史提供了一个很好的机会来测试目前的理论，二元演化，质量传递和脉动。
We analyse the pulsating behaviour of TIC 308396022 observed by the TESS mission. The star is a high-amplitude δSct star (HADS) that shows a very rich amplitude spectrum using the 3-yr light curve. Among these frequencies, the strongest peak of f1 = 13.20362567(12) d−1 is identified as the radial fundamental mode, and we also find the first and second overtones ( f2 and f3). In the low frequency range (< 2.5 d−1), 22 peaks are identified to be gravity modes, which show a regular period spacing of about 2460 s and have the angular degree l = 1. The period spacing pattern does not show a significant downward trend, suggesting the star rotates slowly. We note that this is a δSct–γDor hybrid star containing a high-amplitude radial fundamental mode and a regular g-mode period spacing pattern. With O-C analysis, we find the star shows a significant time delay, implying that the star has a companion which is likely to be a white dwarf. The history of possible mass transfer provides a great opportunity to test the current theories of binary evolution, mass transfer, and pulsation.