The physics behind the non-linearity of the cepheid period-luminosity relation

S. Kanbur, C. Ngeow

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


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.

Original languageEnglish
Pages (from-to)691-693
Number of pages3
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number576
StatePublished - 2005
EventSymposium - The Three-Dimensional Universe with Gaia - Paris, France
Duration: 4 Oct 20047 Oct 2004


  • Cepheid
  • Distance Scale
  • Stellar Structure and Pulsation


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