Subject
- early-type stars3
- galaxy planes3
- giant stars3
- infrared sources3
- multiple stars3
- population ii stars3
- spectral energy distribution3
- subdwarf stars3
- supergiant stars3
- two-color diagrams3
- astronomical models2
- be stars2
- carbon stars2
- galaxy clusters2
- h alpha photometry2
- hst photometry2
- late-type stars2
- molecular clouds2
- nebulae2
- planetary nebulae2
