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dc.contributor.advisorZačs, Laimons
dc.contributor.authorPuķītis, Kārlis
dc.contributor.otherLatvijas Universitāte. Fizikas un matemātikas fakultāte
dc.date.accessioned2017-07-01T01:10:25Z
dc.date.available2017-07-01T01:10:25Z
dc.date.issued2017
dc.identifier.other59822
dc.identifier.urihttps://dspace.lu.lv/dspace/handle/7/35468
dc.description.abstractIzmantojot augstas izšķirtspējas spektrus, noteikta 30 dažādu ķīmisko elementu koncentrācija zvaigznes HD235858 fotosfērā, tostarp diviem elementiem (Sr un Mo) koncentrācijas novērtētas pirmo reizi. Novērotas zvaigznes spektra izmaiņas laika gaitā un to izcelsme saistīta ar oglekli saturošo molekulu (C2 un CN) formēšanos ārējos zvaigznes atmosfēras slāņos. Secināts, ka visticamākais iemesls ķīmisko elementu koncentrāciju nesakritībām vairāku autori starpā, ir zvaigznes spektra mainīgums un apjomīgā spektrāllīniju blendēšanās. No elementu daudzuma sadalījuma HD235858 fotosfērā izspriests, ka zvaigzne radusies vidē, kas bijusi bagātināta ar pārnovu sprādzienu atliekām.
dc.description.abstractAbundances of 30 chemical elements in photosphere of the star HD235858 were derived based on high resolution spectroscopy. Abundances of two elements (Sr and Mo) were calculated for the first time. It was observed that spectrum of the star varies by time. This variation was found to be an effect of formation of carbon based molecules (C2 and CN) in the outer layers of atmosphere of the star. It was concluded that derived chemical abundance variations among works of different authors are most likely due to variability of the spectra and intense blending of spectral lines. Using calculated HD235858 photospheric abundance pattern, it was shown that the star has formed in region which was full of remnants from supernova explosions.
dc.language.isolav
dc.publisherLatvijas Universitāte
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectFizika
dc.subjectzvaigžņu spektroskopija
dc.subjectAGB zvaigznes
dc.subjectpost-AGB zvaigznes
dc.subjects-procesa nukleosintēze
dc.titleZvaigznes HD235858 augstas izšķirtspējas spektroskopija un modelēšana
dc.title.alternativeHigh-resolution spectroscopy and modelling of the star HD235858
dc.typeinfo:eu-repo/semantics/bachelorThesis


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