Mass-loss and Recent Spectral Changes in the Yellow Hypergiant Rho Cassiopeiae

A. Lobel, J. Aufdenberg, I. Ilyin +1

The yellow hypergiant Rho Cassiopeiae (F-G Ia0) has recently become very active with a tremendous outburst event in the fall of 2000. During the event the pulsating supergiant dimm…