The Interferometric Orbit and Fundamental Parameters for Spica from the CHARA and SUSI Arrays

J.~P. Aufdenberg, M. Ireland, A. Mérand, J. Monnier, M. Zhao, E. Pedretti, N. Thureau, S. Ridgway, V. Coudé du Foresto, W. Bagnuolo, D. Gies, T. ten Brummelaar, H. McAlister, J. Sturmann, L. Sturmann, N. Turner, A. Jacob, R. Riddle, B. Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two- and three-telescope data obtained with the Center for High Angular Resolution (CHARA) Array instruments FLUOR and MIRC along with data from the Sydney University Stellar Interferometer (SUSI) have been obtained for the massive, non-eclipsing, double-line spectroscopic binary Spica, a 4-day period system where the components are both tidally and rotationally distorted. These data have been analyzed using detailed binary star model atmospheres for triaxial stars. Our revised analysis finds orbital and physical parameters in general agreement with 1971 study by Herbison-Evans et al. which resolved Spica's components for the first time. The disagreement between Spica's observed apsidal motion and the expected distribution of mass within the primary star remains unresolved.
Original languageEnglish
Title of host publicationAmerican Astronomical Society Meeting Abstracts 213
Pages214
Volume41
Publication statusPublished - 1 Jan 2009

Publication series

NameBulletin of the American Astronomical Society

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    Aufdenberg, J. P., Ireland, M., Mérand, A., Monnier, J., Zhao, M., Pedretti, E., Thureau, N., Ridgway, S., Coudé du Foresto, V., Bagnuolo, W., Gies, D., ten Brummelaar, T., McAlister, H., Sturmann, J., Sturmann, L., Turner, N., Jacob, A., Riddle, R., & Shah, B. (2009). The Interferometric Orbit and Fundamental Parameters for Spica from the CHARA and SUSI Arrays. In American Astronomical Society Meeting Abstracts 213 (Vol. 41, pp. 214). (Bulletin of the American Astronomical Society).