Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-06-07
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures, Astron. Astrophys., in press
Scientific paper
10.1051/0004-6361:20010682
We present surface temperature maps for the FK Comae-type star HD 199178 (V1794 Cygni) calculated from high resolution spectra obtained in 1994 and 1995. The spot pattern evolves, but all maps reveal a large cool spot remaining nearly at the same high latitude. The main spot is 1200 -- 1600 K cooler than the mean surface temperature. The observed slightly flat bottomed absorption lines would usually be interpreted as evidence for a large cool polar spot. We argue that antisolar surface differential rotation offers a better explanation for the box like shape of the line profiles. However, we do not find conclusive evidence for antisolar differential rotation and note that there are still other possible explanations for the slightly flat bottomed line profiles.
Hackman Thomas
Jetsu Lauri
Tuominen Ilkka
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