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Method of standard candles for determining distances in the Universe
Mádlová, Tereza ; Šolc, Martin (advisor) ; Mészáros, Attila (referee)
The aim of this bachelor's thesis is to enrich the reader's knowledge about methods of determining distances in the universe. This study is particularly focused on the history of the evolution of these methods, a physical descrip- tion of the problem and interim results. Primarily, this thesis deals with the method of standard candles. First, the main information necessary for study- ing the methods of determining distances in the universe is clarified. Then the thesis describes in detail the issue of important historical events and inventions which affected the evolution of these methods. Through these topics we obtain knowledge of this method, and the knowledge of the theory of the expansion of the universe as well. 1
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Distance to nearby galaxies
Šándorová, Ivana ; Zasche, Petr (advisor) ; Wolf, Marek (referee)
Title: Distance to nearby galaxies Author: Ivana Šándorová Institute: Astronomical Institute of the Charles University Supervisor: doc. RNDr. Petr Zasche, Ph.D., Astronomical Institute of the Charles University Abstract: The present work is focused on the study of the variable stars, particularly the lumi- nosity of cepheids in The Large Magellanic Cloud. The data were obtained from photometric observations of starfield (image centre coordinates: RA: 5◦13 36 , DE: −69h 22m 42s) using the 1,54 m Danish telescope at the observatory La Silla in Chile. The aim of this work was to find the distance of Large Magellanic Cloud, which was determined by the "period - lu- minosity relation" method for cepheids. We studied 13 cepheids, which were compared with one non-variable star. We computed the average value of distance modulus as (18,42 ± 0,40) mag. The distance modulus from the latest publication (Pietrzi'nski, G. and others, 2019) is (18,477 ± 0,004 (statistic) ± 0,026 (systematic)) mag. SIPS (Scientific Image Processing System) is software for measuring and processing of images of star field and was used in this work for processing of photometric images of star field. Own program was used for creating and editing the light curves. Keywords: galaxy, variable stars, cepheids, distance modulus 1
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Survey of the basic cosmological discoveries from years 1910-1930
Liška, Andrej ; Mészáros, Attila (advisor) ; Křížek, Michal (referee)
Between 1910 and 1930 a large number of astronomical discoveries took place. Henrietta Swan Leavitt revealed the relationship between the luminosity and the period of Cepheids, which then bacame the indicators for distance de- termination in the universe. Based on this relation in 1925 Edwin Powell Hubble calculated the distance to our neighboring Galaxy M31. Tireless exploration of the nebulae by Vesto Melvin Slipher brought a very important ratio between the red and blue shifts, where the red ones clearly dominated. In 1927 Georges Edouard Lemaître derived Hubble's law from Einstein's field equations, indepen- dently on Alexander Alexandrovich Friedmann. Two years later Hubble definitely demonstrated the linear behavior between the red shift and the distance. 1
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CCD photometry of variable objects in nearby galaxies
Kára, Jan ; Wolf, Marek (advisor) ; Zasche, Petr (referee)
The work concerns the study of variable stars in the Small Magellanic Cloud with use of time series of photometric images of star field NGC 330, which were obtained by the 1,54-m Danish telescope at the observatory La Silla in Chile during years 2012 - 2016. The aim of this work is to produce light curves of variable stars a to determine their period of variability assuming the variations are periodical. For some stars data from earlier published papers were used, which led to the coverage of longer period of time and therefore to the improvement of the accuracy of the period determination. The work lists summary of some of the types of variable stars and of mechanisms causing their variability. The work focus mainly on cepheids, which can be used to determine distances in the Universe thanks to the relation between their absolute magnitude and period of pulsation.
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Method of standard candles for determining distances in the Universe
Mádlová, Tereza ; Šolc, Martin (advisor) ; Mészáros, Attila (referee)
The aim of this bachelor's thesis is to enrich the reader's knowledge about methods of determining distances in the universe. This study is particularly focused on the history of the evolution of these methods, a physical descrip- tion of the problem and interim results. Primarily, this thesis deals with the method of standard candles. First, the main information necessary for study- ing the methods of determining distances in the universe is clarified. Then the thesis describes in detail the issue of important historical events and inventions which affected the evolution of these methods. Through these topics we obtain knowledge of this method, and the knowledge of the theory of the expansion of the universe as well. 1
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