Tahina Ramiaramanantsoa, Rathish Ratnasingam, Tomer Shenar, Anthony F. J. Moffat, Tamara M. Rogers, Adam Popowicz, Rainer Kuschnig, Andrzej Pigulski, Gerald Handler, Gregg A. Wade, Konstanze Zwintz, Werner W. Weiss
- Stochastically triggered photospheric light variations reaching similar to 40 mmag peak-to-valley amplitudes have been detected in the O8 Iaf supergiant V973 Scorpii as the outcome of 2 months of high-precision time-resolved photometric observations with the BRIght Target Explorer (BRITE) nanosatellites. The amplitude spectrum of the time series photometry exhibits a pronounced broad bump in the low-frequency regime (less than or similar to 0.9 d(-1)) where several prominent frequencies are detected. A time-frequency analysis of the observations reveals typical mode lifetimes of the order of 5-10 d. The overall features of the observed brightness amplitude spectrum of V973 Sco match well with those extrapolated from two-dimensional hydrodynamical simulations of convectively driven internal gravity waves randomly excited from deep in the convective cores of massive stars. An alternative or additional possible source of excitation from a sub-surface convection zone needs to be explored in future theoretical investigations.
MetadatenAuthor details: | Tahina RamiaramanantsoaORCiD, Rathish RatnasingamORCiD, Tomer ShenarORCiDGND, Anthony F. J. Moffat, Tamara M. Rogers, Adam Popowicz, Rainer Kuschnig, Andrzej PigulskiORCiD, Gerald Handler, Gregg A. Wade, Konstanze Zwintz, Werner W. Weiss |
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DOI: | https://doi.org/10.1093/mnras/sty1897 |
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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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Subtitle (English): | hints towards internal gravity waves or sub-surface convection zones |
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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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Date of first publication: | 2018/07/19 |
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Publication year: | 2018 |
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Release date: | 2021/09/24 |
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Tag: | convection; stars: massive; supergiants; techniques: photometric; waves |
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Volume: | 480 |
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Issue: | 1 |
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Number of pages: | 15 |
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First page: | 972 |
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Last Page: | 986 |
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Funding institution: | CanadianSpace Agency (CSA); Natural Sciences and Engineering Research Council of Canada (NSERC)Natural Sciences and Engineering Research Council of Canada; Fonds de Recherche du Quebec Nature et Technologies (ERQNT); NCN grant [2016/21/D/ST9/00656]; NCN [2016/21/B/ST9/01126]; SPUB grant of the Polish Ministry of Science and Higher Education (MNiSW); Polish NCN [2015/18/A/ST9/00578]; NSERCNatural Sciences and Engineering Research Council of Canada; CSA; Austrian Space Application Programme (ASAP) of the Austrian Research Promotion Agency (FFG); [POIG.02.03.01-24-099/13] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Green Open-Access |
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