A1 Refereed original research article in a scientific journal

Doppler images and the underlying dynamo The case of AF Leporis




AuthorsJarvinen SP, Arlt R, Hackman T, Marsden SC, Kuker M, Ilyin IV, Berdyugina SV, Strassmeier KG, Waite IA

PublisherEDP SCIENCES S A

Publication year2015

JournalAstronomy and Astrophysics

Journal name in sourceASTRONOMY & ASTROPHYSICS

Journal acronymASTRON ASTROPHYS

Article numberARTN A25

Volume574

Number of pages18

ISSN0004-6361

DOIhttps://doi.org/10.1051/0004-6361/201424229

Web address http://www.aanda.org/articles/aa/abs/2015/02/aa24229-14/aa24229-14.html


Abstract

Results. The photometric record of AF Lep reveals both long-and short-term variability. However, the current data set is too short for cycle-length estimates. From the photometry, we have determined the rotation period of the star to be 0.9660 +/- 0.0023 days. The surface temperature maps show a dominant, but evolving, high-latitude (around +65 degrees) spot. Detailed study of the photometry reveals that sometimes the spot coverage varies only marginally over a long time, and at other times it varies rapidly. Of a suite of dynamo models, the model with a radiative interior rotating as fast as the convection zone at the equator delivered the highest compatibility with the obtained Doppler images.




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