Editing Variable star (section)

=====Yellow hypergiants=====
{{Main|Yellow hypergiant}}

These massive evolved stars are unstable due to their high luminosity and position above the instability strip, and they exhibit slow but sometimes large photometric and spectroscopic changes due to high mass loss and occasional larger eruptions, combined with secular variation on an observable timescale. The best known example is [[Rho Cassiopeiae]].