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Interferometric Constraints on Gravity Darkening with Application to the Modeling of Spica A & B

Aufdenberg, J.P. ; Ireland, M. J. ; Mérand, A. ; du Foresto, V. Coudé ; Absil, O. ; Folco, E. Di ; Kervella, P. ; Bagnuolo, W. G. ; Gies, D. R. ; Ridgway, S. T. ; Berger, D. H. ; ten Brummelaar, T. A. ; McAlister, H. A. ; Sturmann, J. ; Sturmann, L. ; Turner, N. H. ; Jacob, A. P.

In: Proceedings of the International Astronomical Union, 2006, vol. 2, no. S240, p. 271-280

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    Titre
    • Interferometric Constraints on Gravity Darkening with Application to the Modeling of Spica A & B
    Auteur
    • Aufdenberg, J.P.. National Optical Astronomy Observatory, 950 N. Cherry Ave, Tucson, AZ 85719, USA email: aufded93@erau.edu
    • Ireland, M. J.. Planetary Science, California Institude of Technology, 1200 E. California Blvd, Mail Code 150-21, Pasadena CA 91125, USA
    • Mérand, A.. The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023, USA
    • du Foresto, V. Coudé. LESIA, UMR 8109, Observatoire de Paris, 5 place J. Janssen, 92195 Meudon, France
    • Absil, O.. Insitut d'Astrophysique et de Géophysique, University of Liège, 17 Allée du Six Août, B-40000 Liège, Belgium
    • Folco, E. Di. Observatoire de Genève, Switzerland
    • Kervella, P.. LESIA, UMR 8109, Observatoire de Paris, 5 place J. Janssen, 92195 Meudon, France
    • Bagnuolo, W. G.. Center for High Angular Resolution Astronomy, Department of Physics and Astronomy, Georgia State University, P.O. Box 3969, Atlanta, GA 30302, USA
    • Gies, D. R.. Center for High Angular Resolution Astronomy, Department of Physics and Astronomy, Georgia State University, P.O. Box 3969, Atlanta, GA 30302, USA
    • Ridgway, S. T.. National Optical Astronomy Observatory, 950 N. Cherry Ave, Tucson, AZ 85719, USA email: aufded93@erau.edu
    • Berger, D. H.. University of Michigan, Department of Astronomy, 500 Church St, 917 Dennison Bldg., Ann Arbor, MI 48109, USA
    • ten Brummelaar, T. A.. The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023, USA
    • McAlister, H. A.. Center for High Angular Resolution Astronomy, Department of Physics and Astronomy, Georgia State University, P.O. Box 3969, Atlanta, GA 30302, USA
    • Sturmann, J.. The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023, USA
    • Sturmann, L.. The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023, USA
    • Turner, N. H.. The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023, USA
    • Jacob, A. P.. School of Physics, University of Sydney, NSW 2006, Austrailia
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Proceedings of the International Astronomical Union, 2006, vol. 2, no. S240, p. 271-280. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:294691
    Summary
    In 2005 we obtained very precise interferometric measurements of the pole-on rapid rotator Vega (A0 V) with the longest baselines of the Center for High Angular Angular Resolution (CHARA) Array and the Fiber Linked Unit for Optical Recombination (FLUOR). For the analysis of these data, we developed a code for mapping sophisticated PHOENIX model atmospheres on to the surface of rotationally distorted stars described by a Roche-von Zeipel formalism. Given a set of input parameters for a star or binary pair, this code predicts the interferometric visibility, spectral energy distribution and high-resolution line spectrum expected for the system. For the gravity-darkened Vega, our model provides a very good match to the K-band interferometric data, a good match to the spectral energy distribution - except below 160 nm - and a rather poor match to weak lines in the high dispersion spectrum where the model appears overly gravity darkened. In 2006, we used the CHARA Array and FLUOR to obtain high precision measurements of the massive, non-eclipsing, double-line spectroscopic binary Spica, a 4-day period system where both components are gravity darkened rapid rotators. These data supplement recent data obtained with the Sydney University Stellar Interferometer (SUSI). Our study follows the classic 1971 study by Herbison-Evans et al. who resolved Spica as a binary with the Narrabri Stellar Intensity Interferometer (NSII). We will report on our progress modeling the new interferometric and archival spectroscopic data, with the goal towards better constraining the apsidal constant