The Chandra Delta Ori Large Project: Occultation Measurements of the Shocked Gas tn the Nearest Eclipsing O-Star Binary

The Chandra Delta Ori Large Project: Occultation Measurements of the Shocked Gas tn the Nearest Eclipsing O-Star Binary

Delta Ori is the nearest massive, single-lined eclipsing binary (O9.5 II + B0.5III). As such it serves as a fundamental calibrator of the mass-radius-luminosity relation in the upper HR diagram. It is also the only eclipsing O-type binary system which is bright enough to be observable with the CHAND...

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Hauptverfasser: Corcoran, Michael F., Nichols, Joy, Naze, Yael, Rauw, Gregor, Pollock, Andrew, Moffat, Anthony, Richardson, Noel, Evans, Nancy, Hamaguchi, Kenji, Oskinova, Lida, Hamann, W. -R., Gull, Ted, Ignace, Rico, Hole, Tabetha, Iping, Rosina, Walborn, Nolan, Hoffman, Jennifer, Lomax, Jamie, Waldron, Wayne, Owocki, Stan, Maiz-Apellaniz, Jesus, Leutenegger, Maurice, Gayley, Ken, Russell, Chris
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Sprache:eng
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Astronomy
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Zusammenfassung:Delta Ori is the nearest massive, single-lined eclipsing binary (O9.5 II + B0.5III). As such it serves as a fundamental calibrator of the mass-radius-luminosity relation in the upper HR diagram. It is also the only eclipsing O-type binary system which is bright enough to be observable with the CHANDRA gratings in a reasonable exposure. Studies of resolved X-ray line complexes provide tracers of wind mass loss rate and clumpiness; occultation by the X-ray dark companion of the line emitting region can provide direct spatial information on the location of the X-ray emitting gas produced by shocks embedded in the wind of the primary star. We obtained phase-resolved spectra with Chandra in order to determine the level of phase-dependent vs. secular variability in the shocked wind. Along with the Chandra observations we obtained simultaneous photometry from space with the Canadian MOST satellite to help understand the relation between X-ray and photospheric variability.