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Testing of new CCD on E152 - stellar variability
Frýda, Jan ; Kabáth, Petr (advisor) ; Vaňko, Martin (referee)
E152 telescope will be used for future characterization of exoplanets and so testing of its instruments is needed along with construction and testing of a pipeline, which is going to process acquired frames. This pipeline, which performs calibration of frames from photometric CCD camera C4-16000 placed on the E152 telescope and aperture and differential photometry, has been developed, successfully tested and applied on sequences of frames acquired from a testing run of the camera. During this testing run, two flare stars AU Microscopii (AU Mic) and DS Tucanae (DS Tuc) with known exoplanets have been observed. Problems with electronics system and flat frames of the camera have been revealed. Light Curves of stars AU Mic and DS Tuc have been analyzed. No transit or flare has been detected for DS Tucanae A, but a flare has been detected for AU Mic whose energy in Sloan g filter has been approximated as Eflare = 8, 7352.1027 erg which is of the order of expected value within range of error. In the AU Mic field an object with name 2MASS 20450857-3123234 has been detected, it is likely a δ Scuti variable star. 1
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Helium in solar flares
Frýda, Jan ; Kašparová, Jana (advisor) ; Krtička, Jiří (referee)
Solar flares are the most energetical process in the Solar system and massive amount of energy is released during such eruptions in the form of heat, radiation and accelerated particles. Propagation of electron beam in the solar atmosphere is described by the re- sults of the numerical code RADYN, whose results were used in this thesis for studying radiation losses of helium transitions and subsequent determination, if and which helium transitions are important in processes in the solar atmosphere during a solar flare. It was determined by studying height dependency of the radiation losses for various parameter combinations of the electron beam and various times of electron beam propagation in the solar atmosphere that radiation losses of helium transitions are important for modelling of solar flares. Among the most important helium transitions are the transitions 10830.29 Å, 20580.82 Å, 227.84 Å, 503.98 Å and 303.78 Å. 1
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