Physics and Astronomy Faculty Publications and Presentations
Document Type
Article
Publication Date
10-2025
Abstract
We present a detailed analysis of the low-mass detached eclipsing binary system BB Persei, which contains two K-type stars in a circular orbit with a short period of 0.4856 d. We used light curves from the Transiting Exoplanet Survey Satellite (Tess), which observed BB Per in five sectors, to determine its photometric properties and a precise orbital ephemeris. The solution of the Tess light curve in Phoebe results in a detached configuration, where the temperature of the primary component was fixed to T 1 = 5 300 K according to Lamost, which gives us T 2 = 5 050 ± 50 K for the secondary. The spectral type of the primary component was derived as K0 and the photometric mass ratio was estimated q = 0 . 90 . Slow period changes on the current O-C diagram spanning the past 25 years indicate the presence of a third body orbiting the eclipsing pair with an orbital period of about 22 years. The companion could be a red dwarf of spectral type M6–M7 with a minimal mass of about 0.1 M ⊙ . The characteristics and temporal variation of the dark region on the surface of the secondary component were estimated.
Recommended Citation
Wolf, Marek, Petr Zasche, Miloslav Zejda, Martin Mašek, Andrej Mudray, Hana Kučáková, Waldemar Ogłoza, Jaroslav Merc, Jan Kára, and Vojtěch Dienstbier. "TESS light curves and period changes in low-mass eclipsing binary BB Persei." New Astronomy 119 (2025): 102406. https://doi.org/10.1016/j.newast.2025.102406
Publication Title
New Astronomy
DOI
10.1016/j.newast.2025.102406
Comments
Post doc publication.
Original published version available at https://doi.org/10.1016/j.newast.2025.102406