Subject
- horizontal branch stars2
- molecular clouds2
- nebulae2
- ob stars2
- orbits2
- peculiar variable stars2
- population ii stars2
- stellar populations2
- ultraviolet astronomy2
- bl lacertae objects1
- carbon stars1
- comets1
- g stars1
- galactic center1
- galaxy rotation1
- h alpha photometry1
- hst photometry1
- interstellar medium1
- narrow band photometry1
- north galactic pole1
