A Theoretical Investigation into the Properties of RR Lyraes at Maximum and Minimum Light.

Details A Theoretical Investigation into the Properties of RR Lyraes at Maximum and Minimum Light. A Theoretical Investigation into the Properties of RR Lyraes at Maximum and Minimum Light.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20910204f&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #102.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We construct a large grid of full amplitude hydrodynamic models of RRab stars. We confirm earlier findings that, at minimum light, the PC relation is flat and eluucidate the physical reason for this: the interaction of the hydrogen ionization front and photosphere at low densities. Traditionally the properties of RRab stars at minimum light have been used to estimate reddenings. Based on our findings we propose a modification of this method: using the properties of RRab stars with periods greater than about log P = -0.2 to estimate reddensings.

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