FUNDAMENTAL PARAMETERS AND CHEMICAL COMPOSITION OF CEPHEID X SGR.

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dc.contributor.authorUsenko, I. A.
dc.contributor.authorKniazev, A. Yu.
dc.contributor.authorBerdnikov, L. N.
dc.contributor.authorKravtsov, V. V.
dc.date.accessioned2014-03-16T09:12:06Z
dc.date.available2014-03-16T09:12:06Z
dc.date.issued2012
dc.descriptionOdessa Astronomical publications / Одесская астроном. обсерватория . – Одесса : Астропринт, 2012 . – Vol.25/1.uk
dc.description.abstractFive high-resolutioned spectra of unusual Cepheid X Sgr have been obtained during its pulsational period. For the first time we obtain accurate fundamental parameters and abundances of chemical elements, in particular of sodium, magnesium and aluminium. We estimate the mean Teff = 6143 30 K; log g = 2.00; Vt = 4.35 kms -1 . The estimated effective temperature and surface gravity are relatively high compared to the typical values characteristic of Cepheids with pulsational period around 7 days. A deficit of carbon ([C/H] = -0.26 0.04 dex), overabundances of sodium ([Na/H] =+0.31 0.04 dex) and aluminium ([Al/H] = +0.21 0.08 dex) are typical for Cepheids passing through the first dredge-up phase. However, an obvious overabundance of magnesium([Mg/H] = +0.19 0.04 dex) is unusual. The abundance of iron ([Fe/H] = -0.02 0.01 dex) is very close to the solar one. Abundances of α - elements, (those of Fe-group, as well as ”light ” and ”heavy”, s- and r-process elements) are comparable to the solar values, except for several elements showing slight over- or underabundances.uk
dc.identifier.citationOdessa Astronomical Publicationsuk
dc.identifier.urihttps://dspace.onu.edu.ua/handle/123456789/4664
dc.language.isoenuk
dc.publisherAstroprintuk
dc.relation.ispartofseries;vol. 25, issue 1, p. 40-44.
dc.subjectCEPHEID X SGRuk
dc.subjectCHEMICAL COMPOSITIONuk
dc.titleFUNDAMENTAL PARAMETERS AND CHEMICAL COMPOSITION OF CEPHEID X SGR.uk
dc.typeArticleuk
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Odesa Astronomical Publications