CAOSP abstracts, Volume: 54, No.: 2, year: 2024

Author(s): Vaňko, M.; Pribulla, T.; Shagatova, N.; Komžík, R.; Dubovský, P.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 54, no. 2, p. 171-174.
Date: 02/2024
Title: FM CMa: hot and massive eclipsing binary with a pulsating component
Keyword(s): binary stars, eclipses, pulsations
Pages: 171 -- 174
DOI: https://doi.org/10.31577/caosp.2024.54.2.171
NASA ADS Abstract Service: 2024CoSka..54b.171V
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: Long-term spectroscopic monitoring of the eclipsing system FM CMa obtained between 2017 -- 2023 at the Skalnaté Pleso (SPO, Slovakia) and Cerro-Tololo Interamerican observatories (CTIO, Chile) is presented. Preliminary analysis of the TESS high-precision satellite photometry (sectors 7 and 33, only FFI -- Full Frame Image) shows that the eclipses in the system are total, and there is a slow apsidal motion. The light-curve solution requires a substantial amount of third light. In addition, the TESS light curve exhibits low-amplitude variability (in the out-of-eclipse parts), probably caused by radial pulsations with a frequency of about 5.5 cycles/day (4.3 hours). Line profiles show strong asymmetries corresponding to the photometric ephemeris but the possible third component is not visible. The nature of the system is discussed.