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- Title
Quantitative Analysis of the Spectrum of HD 108564.
- Authors
Pavlenko, Y. V.
- Abstract
A quantitative analysis of the spectrum of HD 108564 is performed. It is a star of the main sequence of spectral class K5V, the atmosphere of which is depleted in metals. The high-quality observed HARPS spectra are downloaded from the ESO archive. Abundances of elements in the atmosphere are obtained by fit of observational profiles of the C I lines and selected lines of the C2 molecules, and the O I, Ca I, Si I, Sc II, Cr I, CI, OI, Na I, Mg I, Si I, Ca I, Sc II, Ti I, Ti II, Cr I, Mn I, Fe I, Fe II, Co I, Ni I, Cu I, and Zn I. Abundances are determined iteratively, with a recalculation of the input parameters, which are effective temperature Teff at a fixed value of gravity logg (or log g for a fixed Teff value). The effect of variations of Teff or log g, which provide the same abundances of A(Fe I) and A(Fe II), on the abundances of other elements are determined. The obtained results indicate an excess of light elements (C, O, and Si) compared to the group of iron. The absence of the lithium line at 670.8 nm is confirmed with an estimate of A(Li) < –12.5 for the upper limit of lithium abundance in the abundance scale, in which the sum of all abundances is 1.0. The determined radial velocity equal to Vrad = 111.21 km/s is consistent with the known estimates of other researchers. Apparent rotation velocity V sin i = 1.12 ± 0.5 km/s is determined.
- Subjects
SPECTRUM analysis; MAIN sequence (Astronomy); QUANTITATIVE research; LIGHT elements; TRACE elements; STELLAR spectra; IRON
- Publication
Kinematics & Physics of Celestial Bodies, 2022, Vol 38, Issue 6, p316
- ISSN
0884-5913
- Publication type
Article
- DOI
10.3103/S0884591322060058