Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-24T00:25:01.951Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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
Check for updates
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

Carroll, T. A., Strassmeier, K. G., Rice, J. B., & Künstler, A. 2012, The magnetic field topology of the weak-lined T Tauri star V410 Tauri. New strategies for Zeeman–Doppler imaging. A&A, 548, A95.Google Scholar
Donati, J. F. & Collier–Cameron, A. 1997, Differential rotation and magnetic polarity patterns on AB Doradus. MNRAS, 291(1), 1–19.CrossRefGoogle Scholar
Fekel, F. C., Hall, D. S., Henry, G. W., Landis, H. J., & Renner, T. R. 1982, HD 26337: a New RS CVn Variable Star. Information Bulletin on Variable Stars, 2110, 1.Google Scholar
Fekel, F. C., Moffett, T. J., & Henry, G. W. 1986, A Survey of Chromospherically Active Stars. ApJS, 60, 551.CrossRefGoogle Scholar
Hall, D. S., Osborn, S. A. G., Seufert, E. R., Boyd, L. J., Genet, R. M., & Fried, R. E. 1987, Six Years of Photometry of the RS CVn Binary EI ERI = HD 26337. AJ, 94, 723.CrossRefGoogle Scholar
Hatzes, A. P. & Vogt, S. S. 1992, Doppler images of the spotted RS CVn star HD 26337-1984-87. MNRAS, 258, 387.CrossRefGoogle Scholar
Kövári, Zs., Oláh, K., Kriskovics, L., Vida, K., Forgács-Dajka, E., & Strassmeier, K. G. 2017, Rotation-differential rotation relationships for late-type single and binary stars from Doppler imaging. Astronomische Nachrichten, 338(8), 903–909.Google Scholar
Kövári, Zs., Washuettl, A., Foing, B. H., Vida, K., Bartus, J., Oláh, K., & MUSICOS 98 Team. Doppler maps and surface differential rotation of EI Eri from the MUSICOS 1998 observations. In Stempels, E., editor, 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun 2009, volume 1094 of American Institute of Physics Conference Series, pp. 676–679.CrossRefGoogle Scholar
Kolláth, Z. & Oláh, K. 2009, Multiple and changing cycles of active stars. I. Methods of analysis and application to the solar cycles. A&A, 501(2), 695–702.Google Scholar
Kriskovics, L., Kövári, Z., Seli, B., Oláh, K., Vida, K., Henry, G. W., Granzer, T., & Görgei, A. 2023, EI Eridani: A star under the influence. The effect of magnetic activity in the short and long term. A&A, 674, A143.Google Scholar
Kuiper, N. H. Tests concerning random points on a circle. In Nederl. Akad. Wetensch. Proc. Ser. A 1960, volume 63, pp. 38–47.CrossRefGoogle Scholar
Oláh, K., Kolláth, Z., Granzer, T., Strassmeier, K. G., Lanza, A. F., Järvinen, S., Korhonen, H., Baliunas, S. L., Soon, W., Messina, S., & Cutispoto, G. 2009, Multiple and changing cycles of active stars. II. Results. A&A, 501(2), 703–713.Google Scholar
Oláh, K., Seli, B., Kövári, Z., Kriskovics, L., & Vida, K. 2022, Characteristics of flares on giant stars. arXiv e-prints, arXiv:2210.09710.Google Scholar
Oláh, K. & Strassmeier, K. G. 2002, Starspot cycles from long-term photometry. Astronomische Nachrichten, 323, 361–366.3.0.CO;2-1>CrossRefGoogle Scholar
Pandey, J. C. & Singh, K. P. 2012, A study of X-ray flares - II. RS CVn-type binaries. MNRAS, 419(2), 1219–1237.CrossRefGoogle Scholar
Piskunov, N. & Valenti, J. A. 2017, Spectroscopy Made Easy: Evolution. A&A, 597, A16.Google Scholar
Strassmeier, K. G. 1990, Photometric and Spectroscopic Modeling of Starspots on the RS Canum Venaticorum Binary HD 26337. ApJ, 348, 682.CrossRefGoogle Scholar
Strassmeier, K. G., Rice, J. B., Wehlau, W. H., Vogt, S. S., Hatzes, A. P., Tuominen, I., Piskunov, N. E., Hackman, T., & Poutanen, M. 1991, Doppler imaging of hig-latitude SPOT activity on HD 26337. A&A, 247, 130.Google Scholar
Washuettl, A., Strassmeier, K. G., & Collier–Cameron, A. Latest Doppler images of the RS CVn Binary EI Eridani (CD-ROM Directory: contribs/washuet). In Garcia Lopez, R. J., Rebolo, R. , & Zapaterio Osorio, M. R., editors, 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun 2001, volume 223 of Astronomical Society of the Pacific Conference Series, 1308.Google Scholar
Washuettl, A., Strassmeier, K. G., & Weber, M. 2009, The chromospherically active binary star EI Eridani: II. Long-term Doppler imaging. Astronomische Nachrichten, 330(4), 366.CrossRefGoogle Scholar