Subject
- interstellar medium6
- spectral energy distribution6
- stellar distance6
- bl lacertae objects5
- m stars5
- metallicity5
- radial velocity5
- stellar ages5
- apparent magnitude4
- dwarf stars4
- h i line emission4
- novae4
- radio galaxies4
- stellar associations4
- stellar masses4
- two-color diagrams4
- young stellar objects4
- ccd photometry3
- late-type stars3
- milky way galaxy3
