Comprehensive study of the magnetic stars HD 5797 and HD 40711 with large chromium and iron overabundances |
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Authors: | E A Semenko I A Yakunin E Yu Kuchaeva |
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Institution: | 1.Special Astrophysical Observatory,Russian Academy of Sciences,Nizhnii Arkhyz,Karachai-Cherkessian Republic, Russia |
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Abstract: | We present the results of a comprehensive study of the chemically peculiar stars HD 5797 and HD 40711. The stars have the
same effective^temperature, T
eff = 8900 K, and a similar chemical composition with large iron (+1.5 dex) and chromium (+3 dex) overabundances compared to
the Sun. The overabundance of rare-earth elements typically reaches +3 dex. We have measured the magnetic field of HD 5797.
The longitudinal field component B
e has been found to vary sinusoidally between −100 and +1000 G with a period of 69 days. Our estimate of the evolutionary status
of the stars suggests that HD 5797 and HD 40711, old objects with an age t ≈ 5 × 108 yr, are near the end of the core hydrogen burning phase. |
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Keywords: | |
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