Cepheids; Infall; accretion; and accretion disks; Main-sequence: late-type stars
Abstract :
[en] We present a unique observational study of Spica, a binary system with a primary component of the β Cephei type. We exploit simultaneous high-resolution spectroscopic observations and high-precision photometry obtained by the MOST satellite. An important result is that the MOST photometry reveals Spica as an eclipsing binary contrary to what was quoted in the literature.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Desmet, M.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
Aerts, C.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium ; Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlands
Matthews, J. M.; Departement of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, V6T 1Z1, Canada
Cameron, C.; Department of Astronomy and Physics, Saint Mary's University, 923 Robie street, Halifax, NS B3H 3C3, Canada ; Departement of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, V6T 1Z1, Canada
Kuschnig, R.; Institut für Astronomie, Universität Wien, Turkenschanzstrasse 17, A-1180, Vienna, Austria
Walker, G. A. H.; Departement of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, V6T 1Z1, Canada ; 1234 Hewlett Place, Victoria, BCV8S 4P7, Canada
Yang, S.; Department of Physics and Astronomy, University of Victoria, Victoria, BCV8W 3P6, Canada
Bohlender, D.; Departement of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, V6T 1Z1, Canada
Østensen, R.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
Briquet, Maryline ; Katholieke Universiteit Leuven - KUL > Physics > Institute of Astronomy
Guenther, D. B.; Department of Astronomy and Physics, Saint Mary's University, 923 Robie street, Halifax, NS B3H 3C3, Canada
Moffat, A. F. J.; Départment de physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada
Rucinski, S.; David Dunlap Observatory, University of Toronto, P.O. Box 360, Richmond Hill, ON L4C 4Y6, Canada
Sasselov, D.; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Weiss, W. W.; Institut für Astronomie, Universität Wien, Turkenschanzstrasse 17, A-1180, Vienna, Austria
A. H. Batten, J. M. Fletcher, and D. G. MacCarthy, Publ. of the Dominion Astrophysical Observatory Victoria 17, 1 (1989).
J. P. Aufdenberg, M. J. Ireland, A. Mérand, V Coudé Du Foresto, O. Absil, E. D. Folco, P. Kervella, W. G. Bagnuolo, D. R. Gies, S. T. Ridgway, D. H. Berger, T. A. Ten Brummelaar, H. A. McAlister, J. Sturmann, L. Sturmann, N. H. Turner, and A. P. Jacob, IAU Symposium 240, 271 (2007).
R. B. Herr, ApJ 153, L57 (1968).
R. R. Shobbrook, D. Herbison-Evans, I. D. Johnston, and N. R. Lomb, MNRAS 145, 131 (1969).
N. R. Lomb, MNRAS 185, 325 (1978).
L. A. Balona, MNRAS 217, 17P (1985).
G. A. H. Walker, K. Moyles, S. Yang, and G. G. Fahlman, PASP 94, 143-148 (1982).
M. A. Smith, ApJ 297, 206 (1985).
M. A. Smith, ApJ 297, 224 (1985).
R. J. Dukes, Jr., S. M. Sonnett, and L. R. Mills, Bulletin of the American Astronomical Society 37, 1364 (2005).
G. Walker, J. Matthews, R. Kuschnig, R. Johnson, S. Rucinski, J. Pazder, G. Burley, A. Walker, K. Skaret, R. Zee, S. Grocott, K. Carroll, P. Sinclair, D. Sturgeon, and J. Harron, PASP 115, 1023 (2003).
J. H. Telting, and C. Schrijvers, A&A 339, 150 (1998).
A. Prsa, and T. Zwitter, ApJ 628, 426 (2005).
W. Zima, Communications in Asteroseismology 157, 387 (2008).
