Subject
- ob stars6
- spectral energy distribution6
- subdwarf stars6
- galaxy planes5
- h alpha photometry5
- h ii regions5
- pre-main sequence stars5
- radio galaxies5
- seyfert galaxies5
- supergiant stars5
- a stars4
- astronomical object identification4
- b stars4
- be stars4
- dwarf stars4
- exoplanets4
- gravitational lensing4
- interstellar reddening4
- planetary nebulae4
- proper motions4
