Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-10-03
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
4 pages, 4 figures, submitted to the proceedings of IAU Symposium 273: "Physics of Sun and Star Spots", August 22-26, 2010, D.
Scientific paper
10.1017/S1743921311015341
M dwarfs produce explosive flare emission in the near-UV and optical continuum, and the mechanism responsible for this phenomenon is not well-understood. We present a near-UV/optical flare spectrum from the rise phase of a secondary flare, which occurred during the decay of a much larger flare. The newly formed flare emission resembles the spectrum of an early-type star, with the Balmer lines and continuum in absorption. We model this observation phenomonologically as a temperature bump (hot spot) near the photosphere of the M dwarf. The amount of heating implied by our model (\Delta T_phot ~ 16,000K) is far more than predicted by chromospheric backwarming in current 1D RHD flare models (\Delta T_phot ~ 1200K).
Hawley Suzanne L.
Hilton Eric J.
Holtzman Jon A.
Kowalski Adam F.
Wisniewski John P.
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