Relationship between X-ray and ultraviolet emission of flares from dMe stars observed by XMM-Newton
| Autor: | A. J. J. Raassen, R. Mewe, L. van Driel-Gesztelyi, Graziella Branduardi-Raymont, Manuel Guedel, Louise K. Harra, H. R. M. Kay, Urmila Mitra-Kraev, Marc Audard |
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| Přispěvatelé: | University College of London [London] (UCL), Paul Scherrer Institute, Columbia Astrophysics Laboratory, Columbia University, New York, SRON Netherlands Institute for Space Research, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique solaire, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena Flux FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics medicine.disease_cause 01 natural sciences Luminosity law.invention Observatory law 0103 physical sciences medicine Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics Astrophysics (astro-ph) X-ray Astronomy and Astrophysics Wavelength Stars Space and Planetary Science [SDU]Sciences of the Universe [physics] Physics::Space Physics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Ultraviolet Flare |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2005, 431, pp.679-686. ⟨10.1051/0004-6361:20041201⟩ Astronomy & Astrophysics, 431(2), 679-686. EDP Sciences |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361:20041201⟩ |
| Popis: | We present simultaneous ultraviolet and X-ray observations of the dMe-type flaring stars AT Mic, AU Mic, EV Lac, UV Cet and YZ CMi obtained with the XMM-Newton observatory. During 40 hours of simultaneous observation we identify 13 flares which occurred in both wave bands. For the first time, a correlation between X-ray and ultraviolet flux for stellar flares has been observed. We find power-law relationships between these two wavelength bands for the flare luminosity increase, as well as for flare energies, with power-law exponents between 1 and 2. We also observe a correlation between the ultraviolet flare energy and the X-ray luminosity increase, which is in agreement with the Neupert effect and demonstrates that chromospheric evaporation is taking place. Comment: 8 pages, 4 figures, 3 tables, accepted by A&A (30 Sept. 2004) |
| Databáze: | OpenAIRE |
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