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.
|頁（從 - 到）||691-693|
|期刊||European Space Agency, (Special Publication) ESA SP|
|出版狀態||已出版 - 2005|
|事件||Symposium - The Three-Dimensional Universe with Gaia - Paris, France|
持續時間: 4 10月 2004 → 7 10月 2004