Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345507r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #455.07; Bulletin of the American Astronomical Society, Vol. 41, p.355
Mathematics
Logic
Scientific paper
SIM astrometry can be used in combination with precision ground-based measurements, particularly optical interferometry, and supporting modeling, to address fundamental questions in stellar physics. We will extend an on-going study of Cepheid stars, with emphasis on resolution of possible biases in the use of the P-L relation, aiming for a confidence level of better than 1%. We will determine the radii, Teff, luminosity, and in some cases masses, of massive stars with sufficient accuracy to validate models of their structure and evolution with dramatically improved discrimination. We will determine the orbits of post-Algol systems, to test the hypothesis that they are the precursors to Cataclysmic Variable stars and the wide variety of evolved objects that they produce. We will measure the radii of nearby stars to support asteroseismological studies of the stellar interiors. For all measurements here proposed for SIM, GAIA will not provide a realistic alternative, owing to brightness of the targets, expected errors, and/or required observational cadence.
Aufdenberg Jason Paul
Boyajian Tabetha
Gies Doug
Howell Steve B.
Kervella Pierre
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