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Evolutionary Status of the Ap Stars HD 110066 and HD 153882

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Abstract

We present the results of our determination of the fundamental atmospheric parameters for the magnetic chemically peculiar Ap stars HD 110066 (AX CVn) and HD 153882 (V451 Her). The determination of the atmospheric parameters (\(T_{\textrm{eff}}\), \(\textrm{log}{g}\), \(R/R_{\odot}\), and \(L/L_{\odot}\)) is based on a self-consistent analysis of high-resolution spectra (ESPaDOnS with \(R=65\,000\)) and the observed flux distribution in a wide spectral range. We have derived the radial magnetic field components \(B_{r}=4015\pm 180\) G for HD 110066 and \(B_{r}=3800\pm 200\) G for HD 153882 from the observed line splitting and magnetic differential broadening. We have analyzed the chemical composition and the vertical distribution (stratification) of Fe and Cr in atmospheric depth, because the lines of these elements make the greatest contribution to the absorption and stratification affects the distribution of the outgoing flux. We have constructed model atmospheres and determined the evolutionary status of these stars by taking into account the anomalous chemical composition and stratification. The positions of HD 110066 and HD 153882 on the Hertzsprung–Russell diagram confirm the observed decrease in the magnetic field strength with stellar age for stars with masses greater than 2.5 \(M_{\odot}\).

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ACKNOWLEDGMENTS

We thank T. Sitnova for the provided non-LTE calculations of neutral oxygen lines.

Funding

This study was financially supported by the Russian Foundation for Basic Research (project no. 19-32-90147); the work was supported in part by the KP19-270 Program ‘‘Questions of the Origin and Evolution of the Universe with the Application of Methods of Ground-Based Observations and Space Research.’’ In this paper we used the VizieR and VALD databases.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya ul. 48, Moscow, 109017, Russia

    A. M. Romanovskaya & T. A. Ryabchikova

  2. Max-Planck Institut für Sonnensystemforschung, Göttingen, Germany

    D. V. Shulyak

Authors
  1. A. M. Romanovskaya
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  2. T. A. Ryabchikova
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  3. D. V. Shulyak
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Correspondence to A. M. Romanovskaya.

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Translated by V. Astakhov

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Romanovskaya, A.M., Ryabchikova, T.A. & Shulyak, D.V. Evolutionary Status of the Ap Stars HD 110066 and HD 153882. Astron. Lett. 46, 331–343 (2020). https://doi.org/10.1134/S1063773720050060

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