Joy Nichols, David P. Huenemoerder, Michael F. Corcoran, Wayne Waldron, Yael Naze, Andy M. T. Pollock, Anthony F. J. Moffat, Jennifer Lauer, Tomer Shenar, Christopher M. P. Russell, Noel D. Richardson, Herbert Pablo, Nancy Remage Evans, Kenji Hamaguchi, Theodore Gull, Wolf-Rainer Hamann, Lidia M. Oskinova, Rosina Ignace, Jennifer L. Hoffman, Karen Tabetha Hole, Jamie R. Lomax
- We present time-resolved and phase-resolved variability studies of an extensive X-ray high-resolution spectral data set of the delta Ori Aa binary system. The four observations, obtained with Chandra ACIS HETGS, have a total exposure time of approximate to 479 ks and provide nearly complete binary phase coverage. Variability of the total X-ray flux in the range of 5-25 is is confirmed, with a maximum amplitude of about +/- 15% within a single approximate to 125 ks observation. Periods of 4.76 and 2.04 days are found in the total X-ray flux, as well as an apparent overall increase in the flux level throughout the nine-day observational campaign. Using 40 ks contiguous spectra derived from the original observations, we investigate the variability of emission line parameters and ratios. Several emission lines are shown to be variable, including S XV, Si XIII, and Ne IX. For the first time, variations of the X-ray emission line widths as a function of the binary phase are found in a binary system, with the smallest widths at phi = 0.0We present time-resolved and phase-resolved variability studies of an extensive X-ray high-resolution spectral data set of the delta Ori Aa binary system. The four observations, obtained with Chandra ACIS HETGS, have a total exposure time of approximate to 479 ks and provide nearly complete binary phase coverage. Variability of the total X-ray flux in the range of 5-25 is is confirmed, with a maximum amplitude of about +/- 15% within a single approximate to 125 ks observation. Periods of 4.76 and 2.04 days are found in the total X-ray flux, as well as an apparent overall increase in the flux level throughout the nine-day observational campaign. Using 40 ks contiguous spectra derived from the original observations, we investigate the variability of emission line parameters and ratios. Several emission lines are shown to be variable, including S XV, Si XIII, and Ne IX. For the first time, variations of the X-ray emission line widths as a function of the binary phase are found in a binary system, with the smallest widths at phi = 0.0 when the secondary delta Ori Aa2 is at the inferior conjunction. Using 3D hydrodynamic modeling of the interacting winds, we relate the emission line width variability to the presence of a wind cavity created by a wind-wind collision, which is effectively void of embedded wind shocks and is carved out of the X-ray-producing primary wind, thus producing phase-locked X-ray variability.…
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MetadatenAuthor details: | Joy Nichols, David P. Huenemoerder, Michael F. Corcoran, Wayne Waldron, Yael Naze, Andy M. T. Pollock, Anthony F. J. Moffat, Jennifer Lauer, Tomer ShenarORCiDGND, Christopher M. P. Russell, Noel D. Richardson, Herbert Pablo, Nancy Remage Evans, Kenji Hamaguchi, Theodore Gull, Wolf-Rainer HamannORCiDGND, Lidia M. OskinovaORCiDGND, Rosina Ignace, Jennifer L. Hoffman, Karen Tabetha Hole, Jamie R. Lomax |
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DOI: | https://doi.org/10.1088/0004-637X/809/2/133 |
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ISSN: | 0004-637X |
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ISSN: | 1538-4357 |
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Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
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Publisher: | IOP Publ. Ltd. |
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Place of publishing: | Bristol |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2015 |
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Publication year: | 2015 |
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Release date: | 2017/03/27 |
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Tag: | binaries: close; binaries: eclipsing; stars: individual ([HD 36486]delta Ori A) |
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Volume: | 809 |
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Issue: | 2 |
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Number of pages: | 21 |
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Funding institution: | National Aeronautics and Space Administration through Chandra Award
[GO3-14015A, G03-14015E, GO3-14015G]; National Aeronautics Space
Administration [NAS8-03060]; NASA through the Smithsonian Astrophysical
Observatory [SV3-73016]; Fonds National de la Recherche Scientifique
(Belgium); Communaute Francaise de Belgique; PRODEX XMM and Integral
contracts; Action de Recherche Concertee (CFWB-Academie Wallonie
Europe); NSRC (Canada); FRQNT (Quebec); CRAQ (Centre de Recherche en
Astrophysique du Quebec) fellowship; DLR [50 OR 1302]; Chandra X-ray
Center NASA [NAS8-03060]; NASA [NNX13AF40G]; NSF [AST-0807477] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer review: | Referiert |
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