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26 April 2024 |
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AD Leo from X-Rays to Radio: Are Flares Responsible for the Heating of Stellar Coronae? | | M. Guedel
; M. Audard
; E. F. Guinan
; J. J. Drake
; V. L. Kashyap
; R. Mewe
; I. Y. Alekseev
; | | Date: |
30 Nov 2000 | | Subject: | astro-ph | | Affiliation: | Paul Scherrer Institut), E. F. Guinan (Villanova University), J. J. Drake, V. L. Kashyap (Harvard-Smithsonian Center for Astrophysics), R. Mewe (SRON), I. Y. Alekseev (Crimean Astrophysical Observatory | | Abstract: | In spring 1999, a long coordinated observing campaign was performed on the flare star AD Leo, including {it EUVE}, {it BeppoSAX}, the {it VLA}, and optical telescopes. The campaign covered a total of 44 days. We obtained high-quality light curves displaying ongoing variability on various timescales, raising interesting questions on the role of flare-like events for coronal heating. We performed Kolmogorov-Smirnov tests to compare the observations with a large set of simulated light curves composed of statistical flares that are distributed in energy as a power law of the form ${
m d}N/{
m d}E propto E^{-alpha}$ with selectable index $alpha$. We find best-fit $alpha$ values slightly above a value of 2, indicating that the extension of the flare population toward small energies could be important for the generation of the overall X-ray emission. | | Source: | arXiv, astro-ph/0011572 | | Services: | Forum | Review | PDF | Favorites | |
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