Subject
- horizontal branch stars5
- north galactic pole5
- optical observation5
- photographic magnitude5
- population ii stars5
- white dwarf stars5
- astronomy4
- astrophysics4
- atomic spectroscopy4
- catalogues4
- eclipsing binary stars4
- halo stars4
- infrared4
- nebulae4
- photographic photometry4
- spectra4
- dwarf stars3
- emission line stars3
- h beta photometry3
- hertzsprung russell diagram3
