Zvaigznes BS17569-0011 augstas izšķirtspējas spektroskopija
Date
2012
Authors
Aberfelds, Artis
Journal Title
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Publisher
Latvijas Universitāte
Abstract
Veikta augstas izšķirtspējas absorbcijas spektra analīze zvaigznei BS17569-0011, kas literatūrā ir klasificētā kā metālnabadzīga vecākās paaudzes zvaigzne ar anomālu enerģijas sadalījumu spektrā. Noteikts masas centra radiālas ātrums, atmosfēras efektīvā temperatūra, virsmas gravitācija, mikroturbulences ātrums un piecu ķīmisko elementu koncentrācijas. Zvaigznes spektrā identificētas intensīvas TiO līnijas un emisija Balmera H līnijā. Atmosfēras parametri ir tipiski sarkanajiem milžiem, Teff = 4250 K, log(g)=1,0 (cgs), = 3,0 km/s. Dzelzs atomu koncentrācija pētāmās zvaigznes atmosfērā ir apmēram 16 reizes zemāka nekā Saules atmosfērā. Elementu koncentrācijas, kas veidojas neitronu satveršanas procesos, ir relatīvi paaugstināta apmēram 10 reizes. Iegūtie rezultāti liecina, ka BS17569-0011 pieder Galaktikas II populācijas zvaigznēm un atrodas sarkanā milža evolūcijas stadijā.
Atslēgvārdi: BS17569-0011 – atmosfēras ķīmiskais sastāvs – augstas izšķirtspējas spektroskopija – zvaigžņu evolūcija – atmosfēru modeļu metode.
During this scientific work high-resolution absorption spectrum analysis of the star BS17569-0011 was performed. Available data classifies it as a metal-poor older generation star with anomalous spectral energy distribution. Extracted data also shows systemic radial velocity, atmospheric effective temperature, surface gravity, microturbulent velocity and abundances of five chemical elements. Star`s spectrum analysis identified intense TiO lines and Balmer H line emission. Atmospheric parameters are typical of red giants, Teff = 4250 K, log (g) = 1.0 (cgs), = 3.0 km / s. Abundance of iron atoms in the current star`s atmosphere is about 16 times lower than in the Solar atmosphere. Element abundances formed neutron capture processes are relatively high, about 10 times higher. The data shows that the BS17569-0011 belongs to the Galactic halo population and red giant branch evolution phase. Key words: BS17569-0011 – atmospheric chemical composition – stellar evolution – high-resolution spectrum analysis – atmospheric model method.
During this scientific work high-resolution absorption spectrum analysis of the star BS17569-0011 was performed. Available data classifies it as a metal-poor older generation star with anomalous spectral energy distribution. Extracted data also shows systemic radial velocity, atmospheric effective temperature, surface gravity, microturbulent velocity and abundances of five chemical elements. Star`s spectrum analysis identified intense TiO lines and Balmer H line emission. Atmospheric parameters are typical of red giants, Teff = 4250 K, log (g) = 1.0 (cgs), = 3.0 km / s. Abundance of iron atoms in the current star`s atmosphere is about 16 times lower than in the Solar atmosphere. Element abundances formed neutron capture processes are relatively high, about 10 times higher. The data shows that the BS17569-0011 belongs to the Galactic halo population and red giant branch evolution phase. Key words: BS17569-0011 – atmospheric chemical composition – stellar evolution – high-resolution spectrum analysis – atmospheric model method.
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