The stellar photosphere-hydrogen ionization front interaction in Classical Pulsators: a theoretical explanation for observed period-colour relations

Susmita Das,Shashi M Kanbur,Earl P Bellinger,Anupam Bhardwaj,Harinder P Singh, Brett Meerdink, Nicholas Proietti, Anthony Chalmers, Ryan Jordan

Monthly Notices of the Royal Astronomical Society（2020）

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摘要

Period–colour and amplitude–colour (PCAC) relations can be used to probe both the hydrodynamics of outer envelope structure and evolutionary status of Cepheids and RR Lyraes. In this work, we incorporate the PCAC relations for RR Lyraes, BL Her, W Vir, and classical Cepheids in a single unifying theory that involves the interaction of the hydrogen ionization front (HIF) and stellar photosphere and...

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关键词

stars: evolution,stars: Population II,stars: variables: Cepheids,stars: variables: RR Lyrae,Galaxy: bulge,Magellanic Clouds

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