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Subject
- h beta photometry[remove]12
- optical astronomy12
- photometry12
- h alpha photometry4
- active galactic nuclei3
- ccd photometry3
- galaxies3
- h ii regions3
- wide-band photometry3
- be stars2
- chemical abundances2
- infrared photometry2
- medium band photometry2
- narrow band photometry2
- open star clusters2
- spectroscopy2
- astronomical models1
- b stars1
- catalogs1
- early-type stars1
