POSTER PAPER 6.05
Surface Imaging of HD 199178: High Latitude Spot and Differential
Rotation
Thomas Hackman, Lauri Jetsu
Institute: Observatory, University of Helsinki
Contact Email: Thomas.Hackman@helsinki.fi
Abstract:
We present surface (Doppler) imaging temperature maps of the FK
Comae-type star HD 199178 (V1794 Cyg). The maps have been calculated from
high resolution spectra and simultaneous Johnson V-photometry
obtained between
1994 and 1997. All maps reveal a high latitude spot, which is
1200-1600 K cooler than the mean surface temperature. The observed
slightly flat bottomed absorption lines can be explained by antisolar
surface differential rotation. The presence of differential rotation is
supported by the variations in the photometric rotation period.
Index Keywords: HD 199178; Doppler Imaging; Starspots; Differential Rotation
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Manuscript submitted: 2001-Sep-04
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.