Psi1 Lupi

Psi¹ Lupi (ψ¹ Lupi) is an red clump giant star located 205 light years away from the Sun, in the Lupus constellation. The star is surrounded by a cold circumstellar envelope, hinted at by the anomaly of the small observed power of the doublet Mg II emission at 2800 angstrom. The absorption cores on the peaks of the emission profiles Mg II k and h are mainly of interstellar origin and only partly due to self-absorption in the star's chromosphere.