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Short and long term spot evolution on EI Eri

Published online by Cambridge University Press:  23 December 2024

L. Kriskovics Open the ORCID record for L. Kriskovics [Opens in a new window] ,
Zs. Kövári Open the ORCID record for Zs. Kövári [Opens in a new window] ,
B. Seli ,
K. Oláh ,
K. Vida Open the ORCID record for K. Vida [Opens in a new window] ,
G. W. Henry ,
T. Granzer  and
A. Görgei Open the ORCID record for A. Görgei [Opens in a new window]
L. Kriskovics*
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Hungary
Zs. Kövári
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Hungary
B. Seli
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Hungary
K. Oláh
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Hungary
K. Vida
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Hungary
G. W. Henry
Affiliation:
Center of Excellence in Information Systems, Tennessee State University, Nashville
T. Granzer
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D14482 Potsdam, Germany
A. Görgei
Affiliation:
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Budapest, Hungary CSFK, MTA Centre of Excellence, Budapest, Hungary Eötvös Loránd University, Hungary
*
email: kriskovics@konkoly.hu
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Abstract

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We investigate flare activity using photometric data obtained with the Transiting Exoplanet Survey Satellite (TESS). Long-term seasonal period analysis was applied on our APT (Automatic Photoelectric Telescopes af Fairborn observatory, Arizona) time series to study changes in the rotational period. We also looked for activity cycle-like changes with short-term Fourier-transform. We also studied the phase and frequency distribution of hand-selected flares on the available TESS data. The MUlti-SIte Continuous Spectroscopy (MUSICOS) campaign was designed in 1998 to achieve high-resolution, multi-wavelength spectroscopic observations from many sites around the globe, which meant that uninterrupted phase coverage of EI Eri became available. We use these data to reconstruct successive surface-temperature maps of the star in order to study the changes of starspots on a very short timescale. We applied our multi-line Doppler imaging code to reconstruct four consecutive Doppler images. These images were also used to measure surface differential rotation with our cross-correlation technique.

Keywords

close binariesstellar magnetic activitystarspotsDoppler imagingdifferential rotation
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 70 - 75
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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