ISM: molecules
Stars: circumstellar matter
Stars: pre-main sequence
Stars: variables: T Tauri
Herbig Ae/Be
ISM: photon-dominated region (PDR)
[SDU.ASTR.SR] Sciences of the Universe/Astrophysics/Solar and Stellar Astrophysics
[PHYS.ASTR.SR] Physics/Astrophysics/Solar and Stellar Astrophysics