SIMBAD references

2014A&A...569A..79J - Astronomy and Astrophysics, volume 569A, 79-79 (2014/9-1)

ε Eridani: an active K dwarf and a planet hosting star? The variability of its large-scale magnetic field topology.

JEFFERS S.V., PETIT P., MARSDEN S.C., MORIN J., DONATI J.-F., FOLSOM C.P. (The BCool collaboration)

Abstract (from CDS):

The young K-dwarf ε Eridani is an example of a young active planet hosting star that has shown over long-term monitoring of its chromospheric emission to exhibit cyclic magnetic activity. In this paper, we investigate how ε Eridani's large-scale magnetic field geometry evolves over the timescale of its S-index cycle using spectropolarimetric observations and the technique of Zeeman-Doppler imaging. Our observations comprise six epochs secured over a time period of nearly seven years, with each almost yearly observational epoch showing a dramatic change in the large-scale magnetic field topology, with no stable regions. The poloidal field varies from strongly dipolar to mono-polar and the toroidal field is non-existent to begin with and then emerges to dominate the magnetic field energy before disappearing and re-emerging again. A potential cycle is detected in the poloidal field, but further observations are needed to confirm this.

Abstract Copyright:

Journal keyword(s): magnetic fields - stars: activity - stars: magnetic field - starspots

Simbad objects: 7

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2019.09.23-09:54:58

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