Article (Scientific journals)
A Coordinated X-Ray and Optical Campaign of the Nearest Massive Eclipsing Binary, δ Orionis Aa. III. Analysis of Optical Photometric (MOST) and Spectroscopic (Ground-based) Variations
Pablo, Herbert; Richardson, Noel D.; Moffat, Anthony F. J. et al.
2015In Astrophysical Journal, 809, p. 134
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Keywords :
binaries: close; binaries: eclipsing; stars: early-type; stars: individual: delta Ori A; stars: mass-loss; stars: variables: general
Abstract :
[en] We report on both high-precision photometry from the Microvariability and Oscillations of Stars (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV P\gt 400 years). This data was collected in concert with X-ray spectroscopy from the Chandra X-ray Observatory. Thanks to continuous coverage for three weeks, the MOST light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Pablo, Herbert;  Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada
Richardson, Noel D.;  Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada
Moffat, Anthony F. J.;  Département de physique and Centre de Recherche en Astrophysique du Québec (CRAQ), Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada
Corcoran, Michael;  CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA ; Universities Space Research Association, 7178 Columbia Gateway Drive, Columbia, MD 21046, USA
Shenar, Tomer;  Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476, Potsdam, Germany
Benvenuto, Omar;  Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Buenos Aires, Argentina ; Instituto de Astrofsíica de La Plata (IALP), CCT-CONICET-UNLP. Paseo del Bosque S/N (B1900FWA), La Plata, Argentina
Fuller, Jim;  TAPIR, Walter Burke Institute for Theoretical Physics, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125, USA ; Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA
Nazé, Yaël  ;  Université de Liège - ULiège
Hoffman, Jennifer L.;  Department of Physics & Astronomy, University of Denver, 2112 East Wesley Avenue, Denver, CO 80208, USA
Miroshnichenko, Anatoly;  Department of Physics and Astronomy, University of North Carolina at Greensboro, Greensboro, NC 27402-6170, USA
Maíz Apellániz, Jesús;  Centro de Astrobiología (CSIC-INTA), ESAC Campus, P.O. Box 78, E-28691 Villanueva de la Caada, Madrid, Spain
Evans, Nancy;  Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA
Eversberg, Thomas;  Schnörringen Telescope Science Institute, Waldbröl, Germany
Gayley, Ken;  Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA
Gull, Ted;  Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Hamaguchi, Kenji;  CRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD 20771, USA
Hamann, Wolf-Rainer;  Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476, Potsdam, Germany
Henrichs, Huib;  Astronomical Institute “Anton Pannekoek,” University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
Hole, Tabetha;  Department of Physics & Astronomy, East Tennessee State University, Box 70652, Johnson City, TN 37614, USA
Ignace, Richard;  Department of Physics & Astronomy, East Tennessee State University, Box 70652, Johnson City, TN 37614, USA
Iping, Rosina;  Universities Space Research Association, 7178 Columbia Gateway Drive, Columbia, MD 21046, USA
Lauer, Jennifer;  Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA
Leutenegger, Maurice;  Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA
Lomax, Jamie;  HL Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
Nichols, Joy;  Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA
Oskinova, Lida;  Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24/25, D-14476, Potsdam, Germany
Owocki, Stan;  Bartol Research Institute, University of Delaware, Newark, DE 19716, USA
Pollock, Andy;  European Space Agency, Apartado 78, Villanueva de la Canada, E-28691 Madrid, Spain
Russell, Christopher M. P.;  X-ray Astrophysics Lab, Code 662, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; Oak Ridge Associated Universities (ORAU), Oak Ridge, TN 37831, USA
Waldron, Wayne;  Eureka Scientific Inc., 2452 Dellmer Street, Suite 100, Oakland, CA 94602, USA
Buil, Christian;  Castanet Tolosan Observatory, 6 place Clémence Isaure, F-31320, Castanet Tolosan, France
Garrel, Thierry;  Observatoire de Juvignac, 19 avenue du Hameau du Golf, F-34990 Juvignac, France
Graham, Keith
Heathcote, Bernard;  Barfold Observatory, Glenhope, Victoria 3444, Australia
Lemoult, Thierry;  Chelles Observatory, 23 avenue Hénin, F-77500 Chelles, France
Li, Dong;  Jade Observatory, Jin Jiang Nan Li, He Bei District, 300251 Tianjin, China
Mauclaire, Benjamin;  Observatoire du Val de lArc, route de Peynier, F-13530 Trets, France
Potter, Mike;  3206 Overland Avenue, Baltimore, MD 21214, USA
Ribeiro, Jose;  Observatorio do Instituto Geografico do Exercito, Lisboa, Portugal
Matthews, Jaymie;  Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada
Cameron, Chris;  Department of Mathematics, Physics & Geology, Cape Breton University, 1250 Grand Lake Road, Sydney, Nova Scotia, B1P 6L2, Canada
Guenther, David;  Institute for Computational Astrophysics, Department of Astronomy and Physics, St. Mary’s University Halifax, NS B3H 3C3, Canada
Kuschnig, Rainer;  Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada ; University of Vienna, Institute for Astronomy, Türkenschanzstrasse 17, A-1180 Vienna, Austria
Rowe, Jason;  NASA Ames Research Center, Moffett Field, CA 94035, USA
Rucinski, Slavek;  Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada
Sasselov, Dimitar;  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Weiss, Werner;  University of Vienna, Institute for Astronomy, Türkenschanzstrasse 17, A-1180 Vienna, Austria)
More authors (37 more) Less
Language :
English
Title :
A Coordinated X-Ray and Optical Campaign of the Nearest Massive Eclipsing Binary, δ Orionis Aa. III. Analysis of Optical Photometric (MOST) and Spectroscopic (Ground-based) Variations
Publication date :
01 August 2015
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, United States - Illinois
Volume :
809
Pages :
134
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 October 2015

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