Subject
- a stars1
- active gal. nuclei1
- asteroseismology1
- barium stars1
- black holes1
- comets1
- eclipsing binary stars1
- f stars1
- galactic center1
- gamma-ray bursts1
- horizontal branch stars1
- intergalactic medium1
- interstellar cloud1
- interstellar clouds1
- narrow band photometry1
- north galactic pole1
- novae1
- occultation1
- orbits1
- photographic photometry1
