A Simplified Picture of the Cepheid Phase Lag
Abstract
By considering the hydrogen ionization zone as a discontinuity which moves in accordance with an energy-jump condition, it is shown that for a range of conditions coinciding with the Cepheid instability strip the emergent luminosity will vary nearly in phase with the outward velocity. A non-linear mecha- nism is suggested to make the luminosity vary just in phase with the velocity
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1968
- DOI:
- 10.1086/149800
- Bibcode:
- 1968ApJ...154..793C