Fundamental parameters and evolutionary status of the magnetic chemically peculiar stars HD 188041 (V1291 Aquilae), HD 111133 (EP Virginis), and HD 204411: spectroscopy versus interferometry - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2019

Fundamental parameters and evolutionary status of the magnetic chemically peculiar stars HD 188041 (V1291 Aquilae), HD 111133 (EP Virginis), and HD 204411: spectroscopy versus interferometry

A. Romanovskaya
  • Function : Author
T. Ryabchikova
  • Function : Author
D. Shulyak
  • Function : Author
G. Valyavin
  • Function : Author
T. Burlakova
  • Function : Author
G. Galazutdinov
  • Function : Author

Abstract

The determination of fundamental parameters of stars is one of the main tasks of astrophysics. For magnetic chemically peculiar stars, this problem is complicated by the anomalous chemical composition of their atmospheres, which requires special analysis methods. We present the results of the effective temperature, surface gravity, abundance, and radius determinations for three CP stars HD 188041, HD 111133, and HD 204411. Our analysis is based on a self-consistent model fitting of high-resolution spectra and spectrophotometric observations over a wide wavelength range, taking into account the anomalous chemical composition of atmospheres and the inhomogeneous vertical distribution for three chemical elements: Ca, Cr, and Fe. For two stars, HD 188041 and HD 204411, we also performed interferometric observations that provided us with the direct estimates of stellar radii. Comparison of the radii determined from the analysis of spectroscopic/spectrophotometric observations with direct measurements of the radii by interferometry methods for seven CP stars shows that the radii agree within the limits of measurement errors, which proves indirect spectroscopic analysis capable of proving reliable determinations of the fundamental parameters of fainter Ap stars that are not possible to study with modern interferometric facilities.
Fichier principal
Vignette du fichier
stz1858.pdf (2.33 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03703555 , version 1 (24-06-2022)

Identifiers

Cite

A. Romanovskaya, T. Ryabchikova, D. Shulyak, K. Perraut, G. Valyavin, et al.. Fundamental parameters and evolutionary status of the magnetic chemically peculiar stars HD 188041 (V1291 Aquilae), HD 111133 (EP Virginis), and HD 204411: spectroscopy versus interferometry. Monthly Notices of the Royal Astronomical Society, 2019, 488, pp.2343-2356. ⟨10.1093/mnras/stz1858⟩. ⟨insu-03703555⟩
7 View
8 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More