Abstract
The CCD echelle spectra of the chromospherically active binary HR 5553 are obtained using the 2.16 m telescope with Coudé echelle spectrograph of Beijing Observatory in April 1996. The features of Ca II H & K, Hα, He I D3 and Ca II IRT2 (λ 8542 AA) & IRT3 (λ 8662 AA) are presented. The absolute fluxes of these lines which provide the useful information to study the chromospheric activity of HR 5553 are given. The fundamental parameters of the cool dwarf component of HR 5553 are determined using the analysis of the observed spectra with a resolution of R ≃ 60000 and signal-to-noise ratio S/N = 100 ∼ 300. A detailed spectroscopic analysis has yielded the following fundamental parameters: Effective temperature: Teff = 4881 K Surface gravity: log(g) = 3.65 Logarithmic iron abundance: [Fe/H] = –0.30 as well as that of other 12 metal elements (relative to the Sun) are listed in the Table II and Table III. Microturbulence: ζ = 1.20 km s-1. Magnetic field measurements of the cool dwarf component of HR 5553 have been made using the Stenflo-Lindegren statistical analysis and the profile-addition technique. The magnetic field strength and filling factor are obtained.
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Xuefu, L., Hongguang, S. & Hongmei, Q. The Fundamental Parameters, Chromospheric Activity and Magnetic Field Measurements of Hr 5553. Astrophysics and Space Science 257, 259–269 (1997). https://doi.org/10.1023/A:1001126712556
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DOI: https://doi.org/10.1023/A:1001126712556