Date:

2026-03-20

DOI Number:

10.3847/1538-4357/ace905

Title of Paper:

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

Journal:

THE ASTROPHYSICAL JOURNAL

Place of Publication:

USA

Project Source:

National Natural Science Foundation ofChina (grant Nos. U1938104 and 12003020)

Key Words:

Delta Scuti variable stars (370); Stellar oscillations (1617)

Summary:

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.

Co-author:

Tao-Zhi Yang,Antonio García Hernández

First Author:

Xiao-Ya Sun

Indexed by:

Journal paper

Correspondence Author:

Zhaoyu Zuo

Document Code:

The Astrophysical Journal, 955:80 (12pp)

Discipline:

Natural Science

First-Level Discipline:

Astronomy

Document Type:

J

Volume:

955

Page Number:

80

Translation or Not:

No

Date of Publication:

2023-09-20

Included Journals:

SCI