Subject
- h i line emission63
- h ii regions27
- halo stars5
- hertzsprung russell diagram1
- high-velocity stars1
- horizontal branch stars3
- hst photometry35
- infrared1
- infrared astronomy181
- infrared photometry415
- infrared sources218
- instruments1
- interferometry21
- intergalactic medium6
- interstellar clouds1
- interstellar masers1
- interstellar medium74
- interstellar reddening14
- kron-cousins photometry5
- late-type stars22