High temporal resolution spectroscopic observations of UV Cet type flare stars

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Stars: Activity, Stars: Chromospheres, Stars: Spectroscopy: Optical, Stars: Flare, Stars: Uv Cet Type, Stars: Late-Type

Scientific paper

We present the first results of a high temporal resolution spectroscopic monitoring of the UV Ceti-type flare stars EQ Vir, DK Leo, CR Dra, DT Vir, CE Boo, VV Lyn, DP Dra, V1054 Oph, AD Leo, BL Lyn and YZ CMi. The observations were done using the IDS spectrograph at the 2.5 m Isaac Newton Telescope (INT) of the El Roque de los Muchachos Observatory (La Palma, Canary Islands, Spain). Intermediate resolution spectra, including the Balmer series from Hβ to H11 as well as the He I λ4026 AA and the Ca II H & K lines, were taken using the R1200B dispersion grating (reciprocal dispersion of 0.48 AA/pixel). The great number of spectra taken each night with high temporal resolution (exposure times as short as 60 s) allows us to analyse the time evolution of the emission lines in order to identify flares. Other variations at different scales have been also observed. A comparison between all the observed stars have been done. Finally, for the strongest flares or changes, we study differences on the behaviour of the lines of interest.

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