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Doppler imaging of the active star PW And

Published online by Cambridge University Press:  26 February 2010

Sheng-hong Gu ,
Andrew Collier Cameron  and
Kang Min Kim
Sheng-hong Gu
Affiliation:
National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, P. R. China email: [email protected]
Andrew Collier Cameron
Affiliation:
SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK
Kang Min Kim
Affiliation:
Korea Astronomy and Space Science Institute, 61-1 Whaam-Dong Yuseong-Gu, Daejeon 305-348, Korea
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Abstract

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We present spot activity of the K2V pre-main-sequence star PW And based on the high-resolution spectroscopic data obtained at Xinglong station and BOAO in 2005 November and December. Using the Least-Squares Deconvolution method, we have derived time series of composite profiles of PW And with high signal to noise ratio. These have been used to reconstruct its starspot pattern via the Doppler imaging method. The result shows that intermediate to high-latitude spots are the dominant features and weak low-latitude spots also appear. Comparing Doppler images from two data subsets, it can be found that almost no difference between two images exists except the small position evolution of weak low-latitude spots, which suggests that the intermediate to high-latitude spots have longer lifetimes than one month, and the low-latitude spots have shorter lifetimes.

Keywords

stars: late-typestars: activitystars: spots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S264: Solar and Stellar Variability: Impact on Earth and Planets , August 2009 , pp. 90 - 92
Copyright
Copyright © International Astronomical Union 2010

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