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Subject
- pre-main sequence stars[remove]600
- photometry321
- infrared photometry237
- open star clusters163
- optical astronomy144
- x-ray sources96
- wide-band photometry81
- young stellar objects73
- spectroscopy67
- infrared astronomy59
- variable stars58
- stellar associations57
- line intensities50
- radial velocity43
- infrared sources41
- molecular clouds40
- stellar masses33
- stellar spectral types30
- millimeter astronomy27
- submillimeter astronomy27
