Period variability in the pulsating extreme helium stars V652 Her and BX Cir

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dc.contributor.authorKilkenny ,David
dc.date.accessioned2025-10-29T10:55:06Z
dc.date.available2025-10-29T10:55:06Z
dc.date.issued2024
dc.description.abstractEighteen 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 μHz (period ∼0.179 d) with amplitude ∼0.002 mag.
dc.identifier.citationKilkenny, D., Worters, H.L. and Baran, A.S., 2024. Period variability in the pulsating Extreme Helium stars V652 Her and BX Cir. Monthly Notices of the Royal Astronomical Society, 527(3), pp.8402-8408.
dc.identifier.urihttps://doi.org/10.1093/mnras/stad3544
dc.identifier.urihttps://hdl.handle.net/10566/21286
dc.language.isoen
dc.publisherOxford University Press
dc.subjectChemically peculiar
dc.subjectV652 Her
dc.subjectBX Cir
dc.subjectStars: oscillations
dc.subjectNATURAL SCIENCES::Physics::Astronomy and astrophysics::Formation and development of stars
dc.titlePeriod variability in the pulsating extreme helium stars V652 Her and BX Cir
dc.typeArticle

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