Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921602m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #216.02; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The well known classical Cepheid, Polaris, has recently become the center of attention. Even though it is a very low amplitude overtone mode pulsator, its proximity makes it one of the best observed Cepheids in the sky. A recent study by Evans et al. (2006) provides a new estimate for its mass based upon its membership in a multiple star system. Several recent interferometric studies have provided refined values for its radii and distance, and spectroscopic studies give specific atmosphere details such as composition and surface gravity. All of this recent scrutiny allows us to use Polaris as a test of stellar pulsation and evolution models. Polaris’ pulsation models are calculated using a linear non-adiabatic static atmosphere code, that will be compared to the physical characteristics obtained from various authors’ stellar evolution models. While there is some general agreement between Polaris' characteristics found in the pulsation and evolution models there still remains a number of unresolved issues.
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