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Doppler imaging of ...
Doppler imaging of LQ Hydrae for 1998-2002
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- Cole, E. M. (författare)
- Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland.
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- Hackman, T. (författare)
- Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland.;Univ Turku, Finnish Ctr Astron ESO, Piikkio 21500, Finland.
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- Kapyka, M. J. (författare)
- Aalto Univ, Dept Comp Sci, ReSoLVE Ctr Excellence, Espoo 00076, Finland.
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- Ilyin, I. (författare)
- Leibniz Inst Astrophys Potsdam, D-14882 Potsdam, Germany.
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Observationell astrofysik
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- Piskunov, Nikolai (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland.;Univ Turku, Finnish Ctr Astron ESO, Piikkio 21500, Finland. (creator_code:org_t)
- 2015-09-03
- 2015
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 581
- Relaterad länk:
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https://www.aanda.or...
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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
- Aims. We study the spot distribution on the surface of LQ Hya during the observing seasons October 1998-November 2002. We look for persistent active longitudes, trends in the level of spot activity and compare to photometric data. Methods. We apply the Doppler imaging technique on photospheric spectral lines using an inversion code to retrieve images of the surface temperature. Results. We present new temperature maps using multiple spectral lines for a total of 7 seasons. Conclusions. We find no evidence for active longitudes persisting over multiple observing seasons. The spot activity appears to be concentrated to two latitude regions. Using the currently accepted rotation period, we find spot structures to show a trend in the phase-time plot, indicative of a need for a longer period. We conclude that the long-term activity of LQ Hya is more chaotic than that of some magnetically active binary stars analyzed with similar methods, but still with clear indications of an activity cycle from the photometry.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: activity
- stars: imaging
- starspots
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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