Frequency analysis of the hybrid δ Sct-γ Dor star CoRoT-102314644

0574934 - ASÚ 2024 RIV FR eng J - Journal Article
Sánchez Arias, Julieta Paz - Creevey, O. L. - Chapellier, E. - Pichon, B.
Frequency analysis of the hybrid δ Sct-γ Dor star CoRoT-102314644.
Astronomy & Astrophysics. Roč. 676, August (2023), č. článku A96. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : asteroseismology * stars * oscillations
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

We aim to analyse the light curve of the hybrid d Sct-? Dor star CoRoT ID 102314644 and characterise its frequency spectrum. Using the detected frequencies, we intend to perform an initial interpretation developing stellar models. The frequency analysis was obtained with a classical Fourier analysis. A detailed analysis of the individual frequencies is performed using phase diagrams and other light curve characteristics. Initial stellar modelling was performed using the Cesam2k and the GYRE code.Results. We detected 29 ? Dor type frequencies in the [0.32 3.66] c/d range and a series of six equidistant periods with a mean period spacing of ?p = 1612 s. In the d Sct domain, we found 38 frequencies in the [8.63 24.73] c/d range and a quintuplet centred on the frequency p(1) = 11.39 c/d, which suggests a rotational period of 3.06 d. The frequency analysis suggests the presence of spots. Nevertheless, we could not dismiss the possibility of a binary system. The initial modelling of the frequency data allowed us to refine its astrophysical parameters. The observed period spacing, a p-mode quintuplet, the possible rotation period, and the analysis of the individual frequencies impose significant constraints on our understanding of differential rotation and magnetic fields operating in A-F-type stars. Nevertheless, it is fundamental to accompany photometric data with spectroscopic measurements to distinguish variations between surface activity from a companion.
Permanent Link: https://hdl.handle.net/11104/0345158