KIC 12602250: A Low-amplitude Double-mode Delta Scuti Star with Amplitude Modulation

DOI: 
10.3847/1538-3881/ac082b
Publication date: 
24/08/2021
Main author: 
Lv, Chenglong
IAA authors: 
Pascual-Granado, J.
Authors: 
Lv, Chenglong;Esamdin, Ali;Zeng, Xiangyun;Pascual-Granado, J.;Yang, Taozhi;Liu, Junhui
Journal: 
The Astronomical Journal
Publication type: 
Article
Volume: 
162
Pages: 
48
Abstract: 
We report a detailed light-curve analysis of the Kepler target Kepler Input Catalog (KIC) 12602250. The results show that KIC 12602250 is a low-amplitude radial double-mode δ-Scuti star with amplitude modulation. The Fourier analysis of the long cadence data (i.e., Q0-Q17, spanning 1471 days) reveals that the variations of the light curve are dominated by the strongest mode with frequency F0 = 11.6141 d<SUP>-1</SUP>, suggesting that KIC 12602250 is a δ-Scuti star. The other independent mode F1 = 14.9741 d<SUP>-1</SUP> is newly detected. The amplitude of the light variations of KIC 12602250 is ~0.06 mag, which indicates that this is a low-amplitude δ-Scuti star; but the ratio of F0/F1 is estimated as 0.7756, which is typical of HADS, and a slow amplitude growth is detected in F1 and f<SUB>3</SUB>, which could be due to stellar evolution, suggesting that KIC 12602250 could be a post-main-sequence δ Scuti that is crossing the instability strip for the first time.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2021AJ....162...48L/abstract
ADS Bibcode: 
2021AJ....162...48L
Keywords: 
Delta Scuti variable stars;Multi-periodic variable stars;Stellar evolution;370;1079;1599;Astrophysics - Solar and Stellar Astrophysics