Bibcode
Bonanno, A.; Corsaro, E.; Del Sordo, F.; Pallé, P. L.; Stello, D.; Hon, M.
Bibliographical reference
Astronomy and Astrophysics, Volume 628, id.A106, 7 pp.
Advertised on:
8
2019
Journal
Citations
4
Refereed citations
4
Description
We present further evidence of acoustic oscillations in the slowly
rotating overactive G8 sub-giant EK Eri. This star was observed with the
1m Hertzsprung SONG telescope at the Observatorio del Teide for two
different runs of 8 and 13 nights, respectively, that were separated by
about a year. We determined a significant excess of power around
νmax = 253 ± 3 μHz in the first observing run
and were able to determine a large separation, Δν = 16.43
± 0.22 μHz. No significant excess of power was instead
detected in a subsequent SONG observing season, as also supported by our
analysis of the simultaneous TESS photometric observations. We propose a
new amplitude-luminosity relation in order to account for the missing
power in the power spectrum. Based on the evolutionary stage of this
object, we argue that a standard α2Ω dynamo
cannot be excluded as the possible origin for the observed magnetic
field.
A table of the radial velocities is only available at the CDS via
anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/628/A106
Based on observations made with the Hertzsprung SONG telescope operated
on the Spanish Observatorio del Teide on the island of Tenerife by the
Aarhus and Copenhagen Universities and by the Instituto de
Astrofísica de Canarias.
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Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
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