The chromospherically active binary star EI Eridani I. Absolute dimensions

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dc.creatorWashuettl, A.
dc.creatorStrassmeier, K. G.
dc.creatorGranzer, T.
dc.creatorWeber, M.
dc.creatorOláh, K.
dc.date2008-09-04
dc.date.accessioned2026-07-07T10:00:40Z
dc.date.available2026-07-07T10:00:40Z
dc.descriptionWe present a detailed determination of the astrophysical parameters of the chromospherically active binary star EI Eridani. Our new radial velocities allow to improve the set of orbital elements and reveal long-term variations of the barycentric velocity. A possible third-body orbit with a period of approximately 19 years is presented. Absolute parameters are determined in combination with the Hipparcos parallax. EI Eri's inclination angle of the rotational axis is confined to 56.0 plus/minus 4.5 degrees, its luminosity class IV is confirmed by its radius of 2.37 plus/minus 0.12 R_Sun. A comparison to theoretical stellar evolutionary tracks suggests a mass of 1.09 plus/minus 0.05 M_Sun and an age of approximately 6.15 Gyr. The present investigation is the basis of our long-term Doppler imaging study of its stellar surface.
dc.identifierhttps://arxiv.org/abs/0809.0782
dc.identifierhttp://arxiv.org/abs/0809.0782
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/168385
dc.subjectAstrophysics
dc.titleThe chromospherically active binary star EI Eridani I. Absolute dimensions
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