Spatially Resolved Ultraviolet Spectroscopy of the Great Dimming of Betelgeuse
| العنوان: | Spatially Resolved Ultraviolet Spectroscopy of the Great Dimming of Betelgeuse |
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| المؤلفون: | Edward F. Guinan, Anita M. S. Richards, Richard Wasatonic, Lynn D. Matthews, Michael Weber, Miguel Montargès, Reimar Leike, Thomas Calderwood, Andrea K. Dupree, Han Uitenbroek, Klaus G. Strassmeier, Thomas Granzer |
| المصدر: | The Astrophysical Journal Dupree, A K, Strassmeier, K G, Matthews, L D, Uitenbroek, H, Calderwood, T, Granzer, T, Guinan, E F, Leike, R, Montargès, M, Richards, A M S, Wasatonic, R & Weber, M 2020, ' Spatially Resolved Ultraviolet Spectroscopy of the Great Dimming of Betelgeuse ', The Astrophysical Journal, vol. 899, no. 1, 68 . https://doi.org/10.3847/1538-4357/aba516 |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, IMAGES, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astronomy & Astrophysics, LONG SECONDARY PERIODS, 01 natural sciences, Stellar mass loss, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Stellar chromospheres, 010303 astronomy & astrophysics, Chromosphere, Solar and Stellar Astrophysics (astro-ph.SR), Space Telescope Imaging Spectrograph, Physics::Atmospheric and Oceanic Physics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Line (formation), Betelgeuse, Physics, M supergiant stars, Photosphere, Science & Technology, CHROMOSPHERE, Stellar atmosphere, Astronomy and Astrophysics, Stellar atmospheres, ALPHA, VARIABILITY, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, Physical Sciences, LUMINOSITY, Astrophysics::Earth and Planetary Astrophysics, Supergiant |
| الوصف: | The bright supergiant, Betelgeuse (Alpha Orionis, HD 39801) experienced a visual dimming during 2019 December and the first quarter of 2020 reaching an historic minimum 2020 February 7$-$13. During 2019 September-November, prior to the optical dimming event, the photosphere was expanding. At the same time, spatially resolved ultraviolet spectra using the Hubble Space Telescope/Space Telescope Imaging Spectrograph revealed a substantial increase in the ultraviolet spectrum and Mg II line emission from the chromosphere over the southern hemisphere of the star. Moreover, the temperature and electron density inferred from the spectrum and C II diagnostics also increased in this hemisphere. These changes happened prior to the Great Dimming Event. Variations in the Mg II k-line profiles suggest material moved outwards in response to the passage of a pulse or acoustic shock from 2019 September through 2019 November. It appears that this extraordinary outflow of material from the star, likely initiated by convective photospheric elements, was enhanced by the coincidence with the outward motions in this phase of the $\sim$400 day pulsation cycle. These ultraviolet observations appear to provide the connecting link between the known large convective cells in the photosphere and the mass ejection event that cooled to form the dust cloud in the southern hemisphere imaged in 2019 December, and led to the exceptional optical dimming of Betelgeuse in 2020 February. 11 pages, 8 figures, Astrophysical Journal, accepted |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0035-8711 1538-3881 0004-637X 1538-3873 0004-6361 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d3aea86824ba1e4ea11df9fd9826593 http://arxiv.org/abs/2008.04945 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....6d3aea86824ba1e4ea11df9fd9826593 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00358711 15383881 0004637X 15383873 00046361 |
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