Reweighing Alpha Virginis: Analyzing The Interferometric Orbit For Spica From CHARA And SUSI

Details Reweighing Alpha Virginis: Analyzing The Interferometric Orbit For Spica From CHARA And SUSI Reweighing Alpha Virginis: Analyzing The Interferometric Orbit For Spica From CHARA And SUSI

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.6301a&link_type=abstract

American Astronomical Society, AAS Meeting #211, #63.01; Bulletin of the American Astronomical Society, Vol. 39, p.853

Astronomy and Astrophysics

Astronomy

Scientific paper

I will present a summary of our analysis of high-precision
interferometric measurements of the massive, non-eclipsing, double-line spectroscopic binary Spica, a 4-day period system where the components are both tidally and rotationally distorted. I analyze data obtained with the Center for High Angular Resolution (CHARA) Array and data obtained with the Sydney University Stellar Interferometer (SUSI). Our study follows the classic 1971 study by Herbison-Evans et al. which resolved Spica's components for the first time using the Narrabri Stellar Intensity Interferometer. This original study assumed the components to be uniformly bright disks. I have developed a code which maps grids of PHOENIX model atmospheres onto rotationally and tidally distorted Roche surfaces. Given the stellar parameters and orbital elements, the code predicts interferometric observables for comparison to observational data. Using this code, a Levenberg-Marquard least-squares fit to the CHARA and SUSI data sets provides a revised set of 'visual' orbital elements for Spica and new constraints on the physical properties of the massive components. This work was partially supported by the Internal Grant Program of ERAU.

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