Subject
- galaxy classification systems46
- astrometry45
- pre-main sequence stars43
- apparent magnitude42
- planetary nebulae39
- chemically peculiar stars38
- ccd photometry33
- early-type stars33
- white dwarf stars32
- k stars31
- stellar ages31
- astrophysical masers29
- interstellar medium29
- f stars28
- infrared sources27
- h ii regions25
- stellar radii25
- astronomical object identification24
- galaxy rotation24
- medium band photometry24
