Period variability in the pulsating Extreme Helium stars V652 Her and BX Cir
Abstract
Eighteen new timings of maxima of the radially pulsating Extreme Helium star, V652 Her, obtained during 2010-2023 are reported, together with 26 new timings of the very similar star, BX Cir, during 2014-2023. New ephemerides are derived from baselines which are now substantially longer than previously published. Both ephemerides are thus refined and, in the case of BX Cir, we find for the first time evidence of a cubic term (the period change rate is decreasing). BX Cir data from the Transiting Exoplanet Survey Satellite (TESS) reveals a previously unreported frequency near 65 ?Hz (period ?0.179 d) with amplitude ?0.002 mag.
Department(s)
Physics, Astronomy, and Materials Science
Document Type
Article
DOI
10.1093/mnras/stad3544
Keywords
stars: chemically peculiar, stars: individual: V652 Her, BX Cir, stars: oscillations, stars: variables: general
Publication Date
1-1-2024
Recommended Citation
Baran, Andrzej S.; Kilkenny; and Worters, "Period variability in the pulsating Extreme Helium stars V652 Her and BX Cir" (2024). Faculty Scholarship. 499.
https://bearworks.missouristate.edu/articles00/499
Journal Title
Monthly Notices of the Royal Astronomical Society
