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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Spectroscopic study of eccentric eclipsing binaries
 Lipták, Jozef ; Wolf, Marek (advisor) ; Zasche, Petr (referee)
Close eccentric eclipsing binary star systems are important to our understanding of stellar formation and evolution. We analyze three such systems - V335 Ser, BW Boo and DR Vul - with emphasis on a possible third body in the systems needed for the system's existence according to the current theoretical models. Using spectra from the Ondřejov Observatory, we attempted to disentangle the spectra of the components and determine the radial velocity solutions for the systems. For V335 Ser we obtain new radial velocity measurements, spectra, and upper limits on the mass of a possible third body. For BW Boo we obtain the spectrum of the third body possibly dynamically connected with the system. Using measured radial velocities and our fit to TESS photometry, we compute best to date parameters for the components and the orbit of the binary system. In the system DR Vul we confirmed the third body and also its nature by obtaining its spectra. We present the first orbital solution available for the central binary. The triple system does not seem to follow the theoretically predicted common inclination of the orbits. 1
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A new study of time variability of the Be star LQ And
 Lipták, Jozef ; Harmanec, Petr (advisor) ; Korčáková, Daniela (referee)
We contradict binary nature of LQ And. Radial velocities of Hα emision are bound to changes less than 2 km/s. We were not able to detect any periodic variability in radial velocities of core and wings of Hα emision nor of line He I 6678 Å. We discus effect of telluric line movement on precision of our measurement. Detected period of 0,415 d in intensity ratio IV /IR needs aditional confirmation. The star overcome striking increase in intensity of the emission accompained by increase in overall brightness and shortening of photometric period from 0,3094 d to 0,3083 d. Our estimated interval of rotational periods of the star lies in between this photometric period and double of it, which shows that rotation might not be responsible for the photometric changes. 1
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See also: similar author names
2 Lipták, Jan
4 Lipták, Juraj
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