Abstract
We give the first results of a study in F-type MS stars using the Hei D 3 absorption feature at λ5876 Å as an indicator of stellar activity and structure. The observations were obtained with the QUB echelle spectrograph at the Cassegrain focus of the 4.2 m William Herschel telescope, and have spectral resolution λ/Δλ≈6×104, and signal-to-noise ratios ≈200. We chose as a first sample 17 F-stars of the Hyades Main Sequence. It was found that Hei D 3 and X-ray emission appear aroundB-V ∼0.3, indicating the onset of sub-surface convection zones. Below this value, in stars withB-V≤0.42–0.44 the behaviour of the Hei D 3 equivalent width against Rossby number is different from that observed in later type stars, indicating that the presence of nonradiative mechanisms other than dynamo must be important in heating the chromospheres of these hotter stars.
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Based on observations made with the William Herschel telescope, operated on the island of La Palma by the Royal Greenwich Observatory, in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofisica de Canarias.
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López, R.J.G., Rebolo, R., Beckman, J.E. et al. The Hei D 3 5876 Å line as an activity and structural indicator in F-type Hyades stars. Astrophys Space Sci 169, 67–75 (1990). https://doi.org/10.1007/BF00640688
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DOI: https://doi.org/10.1007/BF00640688