Subject
- peculiar variable stars2
- photographic magnitude10
- photographic photometry11
- photometry870
- photometry, sdss1
- planetary nebulae11
- polarimetry22
- population ii stars5
- pre-main sequence stars13
- proper motions93
- protostars1
- pulsars18
- qsos1
- quasars188
- radial velocity95
- radio astronomy388
- radio continuum emission97
- radio galaxies89
- radio sources281
- radio spectroscopy7