The Physics Behind the Non-Linearity of the Cepheid Period-Luminosity Relation

Details The Physics Behind the Non-Linearity of the Cepheid Period-Luminosity Relation The Physics Behind the Non-Linearity of the Cepheid Period-Luminosity Relation

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..691k&link_type=abstract

"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me

Physics

1

Cepheid, Stellar Structure And Pulsation, Distance Scale

Scientific paper

Recent observational work has suggested that the Cepheid period-luminosity (PL) relation in the LMC is non-linear. This is because the period-colour (PC) relation in the LMC is also non-linear leading to a non-linear LMC PL relation. We present a possible theoretical explanation for the break in the PC relation. Our explanation relies on the interaction of the hydrogen ionization front with the Cepheid photosphere and the way this interaction changes with phase of pulsation and metallicity to produce the observed changes in the Cepheid PC and PL relation.

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