Skip to main content
profile image
Selected Works of Richard Ignace
Article
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.
The Astrophysical Journal (2015)
  • Herbert Pablo, Université de Montréal
  • Noel D. Richardson, Université de Montréal
  • Anthony F. J. Moffat, Université de Montréal
  • Michael Corcoran, CRESST and X-ray Astrophysics Laboratory
  • Tomer Shenar, Universität Potsdam
  • Omar Benvenuto, Universidad Nacional de La Plata
  • Jim Fuller, University of California - Santa Barbara
  • Yaël Nazé, Université de Liège
  • Jennifer L. Hoffman, University of Denver
  • Anatoly Miroshnichenko, University of North Carolina at Greensboro
  • Jesús Maíz Apellániz, Centro de Astrobiología (CSIC-INTA)
  • Nancy Evans, Smithsonian Astrophysical Observatory
  • Thomas Eversberg, Schnörringen Telescope Science Institute
  • Ken Gayley, University of Iowa
  • Ted Gull, NASA Goddard Space Flight Center
  • Kenji Hamaguchi, CRESST and X-ray Astrophysics Laboratory
  • Wolf-Rainer Hamann, Universität Potsdam
  • Huib Henrichs, University of Amsterdam
  • Tabetha Hole, East Tennessee State University
  • Richard Ignace, East Tennessee State University
  • Rosina Iping, Universities Space Research Association
  • Jennifer Lauer, Smithsonian Astrophysical Observatory
  • Maurice Leutenegger, University of California - Santa Barbara
  • Jamie Lomax, University of Oklahoma
  • Joy Nichols, Smithsonian Astrophysical Observatory
  • Lida Oskinova, Universität Potsdam
  • Stan Owocki, University of Delaware
  • Andy Pollock, European Space Agency
  • Christopher M. P. Russell, NASA Goddard Space Flight Center
  • Wayne Waldron, Eureka Scientific Inc
  • Christian Buil, Castanet Tolosan Observatory
  • Thierry Garrel, Observatoire de Juvignac
  • Keith Graham, Harvard-Smithsonian Center for Astrophysics
  • Bernard Heathcote, Barfold Observatory
  • Thierry Lemoult, Chelles Observatory
  • Dong Li, Jade Observatory
  • Benjamin Mauclaire, Observatoire du Val de lArc
  • Mike Potter
  • Jose Ribeiro, Observatorio do Instituto Geografico do Exercito
  • Jaymie Matthews, University of British Columbia
  • Chris Cameron, Cape Breton University
  • David Guenther, Institute for Computational Astrophysics
  • Rainer Kuschnig, University of Vienna
  • Jason Rowe, NASA Ames Research Center
  • Slavek Rucinski, University of Toronto
  • Dimitar Sasselov, Harvard-Smithsonian Center for Astrophysics
  • Werner Weiss, University of Vienna
Download Find in your library
Abstract
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 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.
Keywords
  • binaries,
  • close,
  • eclipsing,
  • stars,
  • early-type,
  • individual,
  • delta Ori A,
  • mass-loss,
  • general
Disciplines
Publication Date
August 18, 2015
DOI
10.1088/0004-637X/809/2/134
Publisher Statement
Copyright © 2015. The American Astronomical Society. All rights reserved.
Citation Information
Herbert Pablo, Noel D. Richardson, Anthony F. J. Moffat, Michael Corcoran, Tomer Shenar, Omar Benvenuto, Jim Fuller, Yaël Nazé, Jennifer L. Hoffman, Anatoly Miroshnichenko, Jesús Maíz Apellániz, Nancy Evans, Thomas Eversberg, Ken Gayley, Ted Gull, Kenji Hamaguchi, Wolf-Rainer Hamann, Huib Henrichs, Tabetha Hole, Richard Ignace, Rosina Iping, Jennifer Lauer, Maurice Leutenegger, Jamie Lomax, Joy Nichols, Lida Oskinova, Stan Owocki, Andy Pollock, Christopher M. P. Russell, Wayne Waldron, Christian Buil, Thierry Garrel, Keith Graham, Bernard Heathcote, Thierry Lemoult, Dong Li, Benjamin Mauclaire, Mike Potter, Jose Ribeiro, Jaymie Matthews, Chris Cameron, David Guenther, Rainer Kuschnig, Jason Rowe, Slavek Rucinski, Dimitar Sasselov, and Werner Weiss. "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." The Astrophysical Journal 809 (2015): 134.
doi:10.1088/0004-637X/809/2/134
Available at: http://works.bepress.com/richard_ignace/38