Subject
- galaxy rotation6
- narrow band photometry6
- spectrophotometry6
- interferometry5
- interstellar reddening5
- planetary nebulae5
- proper motions5
- stellar populations5
- supernova remnants5
- bl lacertae objects4
- co line emission4
- photographic photometry4
- stellar spectral types4
- x-ray binary stars4
- h beta photometry3
- milky way galaxy3
- open star clusters3
- polarimetry3
- standard stars3
- star atlases3