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Subject
- ob stars[remove]107
- photometry42
- optical astronomy31
- infrared photometry24
- stellar spectral types20
- spectroscopy17
- stellar associations17
- wide-band photometry17
- early-type stars16
- open star clusters15
- magellanic clouds14
- x-ray sources12
- milky way galaxy11
- proper motions11
- radial velocity11
- h ii regions10
- interstellar medium10
- pre-main sequence stars8
- stellar distance8
- young stellar objects8
