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Doppler images of HR 1099 from 1981–1993

Published online by Cambridge University Press:  25 May 2016

S. S. Vogt  and
A. P. Hatzes
S. S. Vogt
Affiliation:
UCO/Lick Observatory, Univ. of California, Santa Cruz, U.S.A.
A. P. Hatzes
Affiliation:
McDonald Observatory, Univ. of Texas, Austin, U.S.A.

Abstract

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We present 23 Doppler images of the spotted RS CVn star HR 1099 (V711 Tau) from 1981 to 1993. All of the images show a large variable-shape cool spot straddling the pole. Many of the images also show a number of isolated low-latitude spots. This image set has been used to track the emergence and evolution of spots on this star over the 12-year interval. The Doppler images are compared to previous ‘few-circular-spot’ photometric model solutions when available. These photometric solutions do not well-represent the spot distribution. We discuss, among other things: the location on the stellar surface where spots first appear, their subsequent movement with time, differential rotation from spot motions, and spot cycles and dynamos within HR 1099.

Type
Session III: “Photospheric Phenomena: Results”
Information
Symposium - International Astronomical Union , Volume 176: Stellar Surface Structure , 1996 , pp. 245 - 259
Copyright
Copyright © Kluwer 1996 

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