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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2402.13885 |
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| _version_ | 1866917594964951040 |
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| author | Jackman, James A. G. Shkolnik, Evgenya L. Loyd, R. O. Parke Richey-Yowell, Tyler Llama, Joe Boyd, David Buchheim, Bob Iadevaia, David Martin, Jack Sims, Forrest Walker, Gary Wetmore, John |
| author_facet | Jackman, James A. G. Shkolnik, Evgenya L. Loyd, R. O. Parke Richey-Yowell, Tyler Llama, Joe Boyd, David Buchheim, Bob Iadevaia, David Martin, Jack Sims, Forrest Walker, Gary Wetmore, John |
| contents | We present the results of a multi-wavelength Pro-Am campaign to study the behaviour of flares from the active M1.5V star binary CR Draconis. CR Dra was observed with TESS 20-s photometry, Swift near-UV (NUV) grism spectroscopy and with ground-based optical photometry and spectroscopy from a global collaboration of amateur astronomers. We detected 14 flares with TESS and Swift simultaneously, one of which also had simultaneous ground-based photometry and spectroscopy. We used the simultaneous two-colour optical and NUV observations to characterise the temperature evolution of the flare and test the accuracy of using optical data to predict NUV emission. We measured a peak temperature of $7100^{+150}_{-130}$ K for this flare, cooler than the typically assumed 9000 K blackbody model used by flare studies. We also found that the 9000 K blackbody overestimated the NUV flux for other flares in our sample, which we attributed to our Swift observations occurring during flare decays, highlighting the phase-dependence for the accuracy of flare models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_13885 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Dragon's Flame of Many Colours: Multi-wavelength Observations of Flares from the Active M Binary CR Draconis Jackman, James A. G. Shkolnik, Evgenya L. Loyd, R. O. Parke Richey-Yowell, Tyler Llama, Joe Boyd, David Buchheim, Bob Iadevaia, David Martin, Jack Sims, Forrest Walker, Gary Wetmore, John Solar and Stellar Astrophysics We present the results of a multi-wavelength Pro-Am campaign to study the behaviour of flares from the active M1.5V star binary CR Draconis. CR Dra was observed with TESS 20-s photometry, Swift near-UV (NUV) grism spectroscopy and with ground-based optical photometry and spectroscopy from a global collaboration of amateur astronomers. We detected 14 flares with TESS and Swift simultaneously, one of which also had simultaneous ground-based photometry and spectroscopy. We used the simultaneous two-colour optical and NUV observations to characterise the temperature evolution of the flare and test the accuracy of using optical data to predict NUV emission. We measured a peak temperature of $7100^{+150}_{-130}$ K for this flare, cooler than the typically assumed 9000 K blackbody model used by flare studies. We also found that the 9000 K blackbody overestimated the NUV flux for other flares in our sample, which we attributed to our Swift observations occurring during flare decays, highlighting the phase-dependence for the accuracy of flare models. |
| title | A Dragon's Flame of Many Colours: Multi-wavelength Observations of Flares from the Active M Binary CR Draconis |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2402.13885 |