A Coordinated X-ray and Optical Campaign of the Nearest Massive Eclipsing Binary, delta Orionis Aa: III. Analysis of Optical Photometric MOST and Spectroscopic (Ground Based) Variations
We report on both high-precision photometry from the MOST space telescope and ground-based spectroscopy of the triple system delta Ori A consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7d, and a more distant tertiary (O9 IV P > 400 yrs). This data was collected in concert with X-ra...
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| creator | Herbert, Pablo Richardson, Noel D Moffat, Anthony F J Corcoran, Michael Shenar, Tomer Benvenuto, Omar Fuller, Jim Yael Naze Hoffman, Jennifer L Miroshnichenko, Anatoly Apellaniz, Jesus Maiz Evans, Nancy Eversberg, Thomas Gayley, Ken Gull, Ted Hamaguch, Kenji Wolf-Rainer Hamann Henrichs, Huib Hole, Tabetha Ignace, Richard Iping, Rosina Lauer, Jennifer Leutenegger, Maurice Lomax, Jamie Nichols, Joy Oskinova, Lida Owocki, Stan Pollock, Andy Russell, Christopher M P Waldron, Wayne Buil, Christian Garrel, Thierry Graham, Keith Heathcote, Bernard Lemoult, Thierry Li, Dong Mauclaire, Benjamin Potter, Mike Ribeiro, Jose Matthews, Jaymie Cameron, Chris Guenther, David Kuschnig, Rainer Rowe, Jason Rucinski, Slavek Sasselov, Dimitar Weiss, Werner |
| description | We report on both high-precision photometry from the MOST space telescope and ground-based spectroscopy of the triple system delta Ori A consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7d, and a more distant tertiary (O9 IV P > 400 yrs). This data was collected in concert with X-ray spectroscopy from the Chandra X-ray Observatory. Thanks to continuous coverage for 3 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 curve of Aa1. While we are unable to recover radial velocity 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 which show evidence for tidally induced pulsations. |
| doi_str_mv | 10.48550/arxiv.1504.08002 |
| format | Article |
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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 which show evidence for tidally induced pulsations.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1504.08002</doi><oa>free_for_read</oa></addata></record> |
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| source | arXiv.org; Open Access: Freely Accessible Journals by multiple vendors |
| subjects | Eclipsing binary stars Light curve Photometry Physics - High Energy Astrophysical Phenomena Physics - Solar and Stellar Astrophysics Radial velocity Space telescopes Spectrum analysis X ray telescopes |
| title | A Coordinated X-ray and Optical Campaign of the Nearest Massive Eclipsing Binary, delta Orionis Aa: III. Analysis of Optical Photometric MOST and Spectroscopic (Ground Based) Variations |
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