Paper:	A Non-LTE Analysis of Doppler Imaging Lines
Volume:	154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop
Page:	1959
Authors:	Bruls, J. H. M. J.; Solanki, S. K.; Schussler, M.
Abstract:	Doppler imaging studies have revealed that most stars with high activity levels have polar spots. Although their existence is corroborated by spectroscopic and photometric measurements, and although theoretical models have been produced that include polar spots, their existence remains controversial. Based on a NLTE radiative transfer analysis of the most-used Doppler-imaging lines we reject the claim that chromospheric activity might be responsible for the features in the spectral lines that are commonly interpreted as polar spots.

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