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Subject
- infrared photometry[remove]237
- photometry237
- pre-main sequence stars[remove]237
- optical astronomy106
- wide-band photometry74
- open star clusters72
- variable stars32
- x-ray sources30
- young stellar objects29
- stellar associations28
- molecular clouds26
- h ii regions15
- stellar spectral types14
- ccd photometry12
- infrared astronomy12
- line intensities12
- h alpha photometry11
- infrared sources11
- millimeter astronomy11
- submillimeter astronomy11