Cat's Eye planetary nebula (post AGB star dusty wind)
Young massive star Eta Carina, also with dusty wind
V and K light curves for a Nova Vulpeculae 1976. About 50 days after outburst, dust forms which absorbes the V light and emits the K light.
HR diagram shows when star atmospheres are cool enough to form dust.
Image Credits: Hubble Heritage & Whittet "Dust in the Galactic Environment"