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Subject
- emission line stars[remove]116
- photometry42
- optical astronomy29
- spectroscopy29
- be stars20
- infrared photometry19
- pre-main sequence stars19
- line intensities14
- wide-band photometry12
- early-type stars11
- h alpha photometry10
- open star clusters10
- surveys9
- infrared astronomy8
- radial velocity8
- astronomical object identification7
- magellanic clouds7
- x-ray sources7
- milky way galaxy6
- planetary nebulae6
