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Doppler imaging of LQ Hydrae for 1998-2002
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..
Aalto Univ, Dept Comp Sci, ReSoLVE Ctr Excellence, Espoo 00076, Finland..
Leibniz Inst Astrophys Potsdam, D-14882 Potsdam, Germany..
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 581, A69Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 581, A69
Keyword [en]
stars: activity, stars: imaging, starspots
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-265588DOI: 10.1051/0004-6361/201425440ISI: 000361803900069OAI: oai:DiVA.org:uu-265588DiVA: diva2:866502
Available from: 2015-11-03 Created: 2015-11-02 Last updated: 2015-11-03Bibliographically approved

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Kochukhov, OlegPiskunov, Nikolai
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