发布时间：2026-03-20

DOI码：10.3847/1538-4357/ace905

论文名称：KIC 9845907: A δ Scuti Star with the First Overtone as the Dominant Frequency and with Many Equidistant Structures in Its Spectrum

发表刊物：THE ASTROPHYSICAL JOURNAL

刊物所在地：USA

项目来源：National Natural Science Foundation ofChina (grant Nos. U1938104 and 12003020)

关键字：Delta Scuti variable stars (370); Stellar oscillations (1617)

摘要：In this paper, we present an analysis of the pulsating behavior of Kepler target KIC 9845907. Using the data from Kepler, we detected 85 significant frequencies, including the first overtone f 1 = 17.597 day−1 as the dominant frequency, the non-radial independent frequency f 3 = 31.428 day−1 (ℓ = 1), as well as two modulation terms f m1 = 0.065 day−1 and f m2 = 1.693 day−1. We found fourteen pairs of triplet structures with f m1 or f m2, four pairs of which can further form quintuplet structures. We note these are the most intriguing features discovered in this study and they were recognized for the first time in δ Scuti stars. We discussed several possible explanations, i.e., beating, the Blazhko effect, combination mode hypothesis, nonlinear mode coupling, large separation, and stellar rotational splitting for these equidistant structures. Our asteroseismic models indicate this modulation with f m1 might be related to the rotational splitting. The study of more δ Scuti stars with triplet and/or quintuplet structures using high-precision space photometry would be helpful to further explore its origin.

合写作者：Tao-Zhi Yang,Antonio García Hernández

第一作者：Xiao-Ya Sun

论文类型：期刊论文

通讯作者：Zhaoyu Zuo

论文编号：The Astrophysical Journal, 955:80 (12pp)

学科门类：理学

一级学科：天文学

文献类型：J

卷号：955

页面范围：80

是否译文：否

发表时间：2023-09-20

收录刊物：SCI