Doppler images of DI Piscium during 2004–2006

摘要: Aims. DI Psc (HD 217352) is a Li-rich, rapidly rotating single K giant. We set out to study the spot configuration and activity level by calculating surface temperature maps of star. Methods. apply Doppler imaging method on high-resolution optical spectroscopy obtained during 2004–2006. Results. In July–August 2004, no clear structures were visible, but coverage increased in July 2005, cool spots emerged, especially at intermediate latitudes. Later September 2006, visible both sides equator. However, map 2006 suffers from bad phase coverage, meaning it not possible draw definite conclusions locations that season. Conclusions. Compared with earlier for other late-type stars similar rotation rates, seems be low state observing season 2004. During 2005 seasons, seen spectral line profiles inferred images increases, contrast our last more comparable what was reported an study. Therefore, can concluded star variable over time. present previous form too short time series about cycle Psc.