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  • B --- Bij. Fizikas, matemātikas un optometrijas fakultātes studentu noslēguma darbi / Faculty of Physics, Mathematics and Optometry - Graduate works
  • Bakalaura un maģistra darbi (FMOF) / Bachelor's and Master's theses
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Zvaigznes HD235858 augstas izšķirtspējas spektroskopija un modelēšana

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Author
Puķītis, Kārlis
Co-author
Latvijas Universitāte. Fizikas un matemātikas fakultāte
Advisor
Začs, Laimons
Date
2017
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Abstract
Izmantojot 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.
 
Abundances 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.
 
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https://dspace.lu.lv/dspace/handle/7/35468
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  • Bakalaura un maģistra darbi (FMOF) / Bachelor's and Master's theses [2775]

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