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Time evolution of m...
Time evolution of magnetic activity cycles in young suns : The curious case of kappa Ceti
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- Saikia, S. Boro (författare)
- Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
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- Luftinger, T. (författare)
- European Space Agcy, European Space Res & Technol Ctr, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
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- Folsom, C. P. (författare)
- Royal Mil Coll Canada, Dept Phys & Space Sci, POB 17000, Kingston, ON K7K 0C6, Canada.;Univ Tartu, Tartu Observ, Observat 1, EE-61602 Toravere, Tartumaa, Estonia.
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- Antonova, A. (författare)
- Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko Chaussee Blvd, Sofia 1784, Bulgaria.;Bulgarian Acad Sci, NAO, 72 Tsarigradsko Chaussee Blvd, Sofia 1784, Bulgaria.
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- Alecian, E. (författare)
- Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France.
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- Donati, J-F (författare)
- Univ Toulouse, UPS OMP, IRAP, Toulouse, France.;CNRS, Inst Rech Astrophys & Planetol, 14 Ave Edouard Belin, F-31400 Toulouse, France.
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- Guedel, M. (författare)
- Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
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- Hall, J. C. (författare)
- Lowell Observ, 1400 West Mars Hill Rd, Flagstaff, AZ 86001 USA.
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Jeffers, S. , V (författare)
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Marsden, S. C. (författare)
- Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia.
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- Metodieva, Y. T. (författare)
- Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
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- Mittag, M. (författare)
- Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany.
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- Morin, J. (författare)
- CNRS, LUPM UMR 5299, Pl Eugene Bataillon, F-34095 Montpellier 05, France.;Univ Montpellier, Pl Eugene Bataillon, F-34095 Montpellier 05, France.
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- Perdelwitz, V (författare)
- Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany.;Ariel Univ, Dept Phys, IL-40700 Ariel, Israel.
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- Petit, P. (författare)
- Univ Toulouse, UPS OMP, IRAP, Toulouse, France.;CNRS, Inst Rech Astrophys & Planetol, 14 Ave Edouard Belin, F-31400 Toulouse, France.
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- Schmid, M. (författare)
- Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
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- Vidotto, A. A. (författare)
- Univ Dublin, Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland.;Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands.
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Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria European Space Agcy, European Space Res & Technol Ctr, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands. (creator_code:org_t)
- 2022-01-26
- 2022
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 658
- Relaterad länk:
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https://hal.archives...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. A detailed investigation of the magnetic properties of young Sun-like stars can provide valuable information on our Sun's magnetic past and its impact on the early Earth.Aims. We determine the properties of the moderately rotating young Sun-like star kappa Ceti's magnetic and activity cycles using 50 yr of chromospheric activity data and six epochs of spectropolarimetric observations.Methods. The chromospheric activity was determined by measuring the flux in the Call H and K lines. A generalised Lomb-Scargle periodogram and a wavelet decomposition were used on the chromospheric activity data to establish the associated periodicities. The vector magnetic field of the star was reconstructed using the technique of Zeeman Doppler imaging on the spectropolarimetric observations.Results. Our period analysis algorithms detect a 3.1 yr chromospheric cycle in addition to the star's well-known similar to 6 yr cycle period. Although the two cycle periods have an approximate 1:2 ratio, they exhibit an unusual temporal evolution. Additionally, the spectropolarimetric data analysis shows polarity reversals of the star's large-scale magnetic field, suggesting a similar to 10 yr magnetic or Hale cycle.Conclusions. The unusual evolution of the star's chromospheric cycles and their lack of a direct correlation with the magnetic cycle establishes kappa Ceti as a curious young Sun. Such complex evolution of magnetic activity could be synonymous with moderately active young Suns, which is an evolutionary path that our own Sun could have taken.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: magnetic field
- stars: imaging
- stars: chromospheres
- stars: activity
- stars: solar-type
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Saikia, S. Boro
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Luftinger, T.
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Folsom, C. P.
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Antonova, A.
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Alecian, E.
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Donati, J-F
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visa fler...
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Guedel, M.
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Hall, J. C.
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Jeffers, S. , V
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Kochukhov, Oleg
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Marsden, S. C.
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Metodieva, Y. T.
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Mittag, M.
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Morin, J.
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Perdelwitz, V
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Petit, P.
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Schmid, M.
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Vidotto, A. A.
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