Tags: Star.
Psi1 Lupi (ψ1 Lupi) is an orange 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.