Noel D. Richardson, Christopher M. P. Russell, Lucas St-Jean, Anthony F. J. Moffat, Nicole St-Louis, Tomer Shenar, Herbert Pablo, Grant M. Hill, Tahina Ramiaramanantsoa, Michael Corcoran, Kenji Hamuguchi, Thomas Eversberg, Brent Miszalski, Andre-Nicolas Chene, Wayne Waldron, Enrico J. Kotze, Marissa M. Kotze, Paul Luckas, Paulo Cacella, Bernard Heathcote, Jonathan Powles, Terry Bohlsen, Malcolm Locke, Gerald Handler, Rainer Kuschnig, Andrzej Pigulski, Adam Popowicz, Gregg A. Wade, Werner W. Weiss
- We report on the first multi-colour precision light curve of the bright Wolf-Rayet binary gamma(2) Velorum, obtained over six months with the nanosatellites in the BRITE-Constellation fleet. In parallel, we obtained 488 high-resolution optical spectra of the system. In this first report on the data sets, we revise the spectroscopic orbit and report on the bulk properties of the colliding winds. We find a dependence of both the light curve and excess emission properties that scales with the inverse of the binary separation. When analysing the spectroscopic properties in combination with the photometry, we find that the phase dependence is caused only by excess emission in the lines, and not from a changing continuum. We also detect a narrow, high-velocity absorption component from the He perpendicular to lambda 5876 transition, which appears twice in the orbit. We calculate smoothed-particle hydrodynamical simulations of the colliding winds and can accurately associate the absorption from He perpendicular to to the leading and trailingWe report on the first multi-colour precision light curve of the bright Wolf-Rayet binary gamma(2) Velorum, obtained over six months with the nanosatellites in the BRITE-Constellation fleet. In parallel, we obtained 488 high-resolution optical spectra of the system. In this first report on the data sets, we revise the spectroscopic orbit and report on the bulk properties of the colliding winds. We find a dependence of both the light curve and excess emission properties that scales with the inverse of the binary separation. When analysing the spectroscopic properties in combination with the photometry, we find that the phase dependence is caused only by excess emission in the lines, and not from a changing continuum. We also detect a narrow, high-velocity absorption component from the He perpendicular to lambda 5876 transition, which appears twice in the orbit. We calculate smoothed-particle hydrodynamical simulations of the colliding winds and can accurately associate the absorption from He perpendicular to to the leading and trailing arms of the wind shock cone passing tangentially through our line of sight. The simulations also explain the general strength and kinematics of the emission excess observed in wind lines such as C III lambda 5696 of the system. These results represent the first in a series of investigations into the winds and properties of gamma(2) Velorum through multi-technique and multi-wavelength observational campaigns.…
MetadatenAuthor details: | Noel D. Richardson, Christopher M. P. Russell, Lucas St-Jean, Anthony F. J. Moffat, Nicole St-LouisORCiD, Tomer ShenarORCiDGND, Herbert Pablo, Grant M. Hill, Tahina Ramiaramanantsoa, Michael Corcoran, Kenji Hamuguchi, Thomas Eversberg, Brent Miszalski, Andre-Nicolas Chene, Wayne Waldron, Enrico J. Kotze, Marissa M. Kotze, Paul Luckas, Paulo Cacella, Bernard Heathcote, Jonathan PowlesORCiD, Terry BohlsenORCiD, Malcolm Locke, Gerald Handler, Rainer Kuschnig, Andrzej Pigulski, Adam Popowicz, Gregg A. Wade, Werner W. Weiss |
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DOI: | https://doi.org/10.1093/mnras/stx1731 |
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ISSN: | 0035-8711 |
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ISSN: | 1365-2966 |
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Title of parent work (English): | Monthly notices of the Royal Astronomical Society |
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Publisher: | Oxford Univ. Press |
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Place of publishing: | Oxford |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2017 |
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Publication year: | 2017 |
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Release date: | 2020/04/20 |
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Tag: | outflows; stars: Wolf-Rayet; stars: early type; stars: individual: gamma(2) Vel; stars: mass loss; stars: winds |
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Volume: | 471 |
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Number of pages: | 15 |
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First page: | 2715 |
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Last Page: | 2729 |
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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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