PREDNASAJUCI / LECTURER :

Ema Šipková

(1) Department of Theoretical Physics and Astrophysics, Masaryk University,
Kotlářská 2, CZ 611 37 Brno, Czech Republic

NAZOV / TITLE :

The Detective’s Guide to Stellar Variability: Sinusoidal Signals Among O–F Main-Sequence Stars

ABSTRAKT / ABSTRACT :

A significant fraction of upper main-sequence stars (spectral
types O, B, A, and F) show periodic brightness variations due to
binarity, pulsations, or inhomogeneities on the stellar surface or the
object’s surroundings. This work aimed to identify stars with simple
sinusoidal flux variations and classify their variability using TESS
photometry, echelle spectroscopy, and archival data. From over 45,000
stars in the initial sample from the TESS Input Catalogue, 34 were
selected for follow-up. Of these, 50.0% were identified as binary
systems, 2.9% as pulsators, 26.5% as spotted star candidates, and 20.6%
remained unclassified. The analysis identified 7 new binaries, 1
pulsating star, and 9 potential spotted stars, highlighting the need for
combined photometric and spectroscopic analysis in variability studies.