- We present the analysis of the optical variability of the early, nitrogen-rich Wolf-Rayet (WR) star WR 7. The analysis of multisector Transiting Exoplanet Survey Satellite (TESS) light curves and high-resolution spectroscopic observations confirm multiperiodic variability that is modulated on time-scales of years. We detect a dominant period of 2.6433 +/- 0.0005 d in the TESS sectors 33 and 34 light curves in addition to the previously reported high-frequency features from sector 7. We discuss the plausible mechanisms that may be responsible for such variability in WR 7, including pulsations, binarity, co-rotating interaction regions (CIRs), and clumpy winds. Given the lack of strong evidence for the presence of a stellar or compact companion, we suggest that WR 7 may pulsate in quasi-coherent modes in addition to wind variability likely caused by CIRs on top of stochastic low-frequency variability. WR 7 is certainly a worthy target for future monitoring in both spectroscopy and photometry to sample both the short (less than orWe present the analysis of the optical variability of the early, nitrogen-rich Wolf-Rayet (WR) star WR 7. The analysis of multisector Transiting Exoplanet Survey Satellite (TESS) light curves and high-resolution spectroscopic observations confirm multiperiodic variability that is modulated on time-scales of years. We detect a dominant period of 2.6433 +/- 0.0005 d in the TESS sectors 33 and 34 light curves in addition to the previously reported high-frequency features from sector 7. We discuss the plausible mechanisms that may be responsible for such variability in WR 7, including pulsations, binarity, co-rotating interaction regions (CIRs), and clumpy winds. Given the lack of strong evidence for the presence of a stellar or compact companion, we suggest that WR 7 may pulsate in quasi-coherent modes in addition to wind variability likely caused by CIRs on top of stochastic low-frequency variability. WR 7 is certainly a worthy target for future monitoring in both spectroscopy and photometry to sample both the short (less than or similar to 1 d) and long (greater than or similar to 1000 d) variability time-scales.…
MetadatenAuthor details: | Jesús Alberto ToaláORCiD, Dominic BowmanORCiDGND, Timothy Van ReethORCiD, Helge Tobias TodtORCiD, Karan DsilvaORCiD, Tomer ShenarORCiDGND, Gloria Suzanne KoenigsbergerORCiD, Sandino Estrada-DoradoORCiD, Lidia M. OskinovaORCiDGND, Wolf-Rainer HamannORCiDGND |
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DOI: | https://doi.org/10.1093/mnras/stac1455 |
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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 University 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: | 2022/05/30 |
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Publication year: | 2022 |
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Release date: | 2024/03/06 |
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Tag: | outflows; stars: Wolft-Rayet; stars: atmospheres; stars: evolution; stars: individual: WR 7; stars: winds |
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Volume: | 514 |
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Issue: | 2 |
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Number of pages: | 9 |
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First page: | 2269 |
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Last Page: | 2277 |
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Funding institution: | DGAPA UNAM PAPIIT project [IA101622]; Marcos Moshinsky Fundation; (Mexico); Research Foundation Flanders (FWO) [1286521N, 12ZB620N];; European Research Council (ERC) under the European Union [772225];; European Union [101024605]; CONACYT [252499]; DGAPA UNAM PAPIIT; [IN103619]; NASA [NAS5-26555]; NASA Office of Space Science [NAG5-7584];; NASA Explorer Program |
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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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| 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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