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We present the first Doppler imaging study of the two rapidly rotating,single K-giants DP CVn and DI Psc in order to study the surface spotconfiguration and to pinpoint their stellar evolutionary status. Opticalspectroscopy and photometry are used to determine the fundamental astrophysicalproperties. Doppler imaging is applied to recover the surface temperaturedistribution for both stars, while photometric light-curve inversions arecarried out for studying the long-term changes of the surface activity of DPCVn. Surface differential rotation of DP CVn is estimated fromcross-correlating the available subsequent Doppler reconstructions separated byroughly one rotation period. Both stars appear to have higher than normallithium abundance, LTE log n of 2.28 (DP CVn) and 2.20 (DI Psc), and aresupposed to be located at the end of the first Li dredge-up on the RGB.Photometric observations reveal rotational modulation with a period of 14.010 d(DP CVn) and 18.066 d (DI Psc). Doppler reconstructions from the availablemapping lines well agree in the revealed spot patterns, recovering rather lowlatitude spots for both stars with temperature contrasts of Delta T ~ 600-800 Kbelow the unspotted photospheric background. Spots at higher latitudes are alsofound but either with less contrast (DP CVn) or with smaller extent (DI Psc). Apreliminary antisolar-type differential rotation with alpha=-0.035 is found forDP CVn from cross-correlating the subsequent Doppler images. Long-termphotometric analysis supports the existence of active longitudes, as well asthe differential rotation.

Doppler imaging of stellar surface structure - XXIV. The lithium-rich single K-giants DP Canum Venaticorum and DI Piscium