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Subject
- accretion[remove]63
- photometry23
- pre-main sequence stars18
- infrared photometry15
- optical astronomy15
- spectroscopy15
- young stellar objects12
- active galactic nuclei11
- x-ray sources11
- line intensities9
- open star clusters9
- stellar masses9
- sloan photometry6
- stellar ages6
- stellar spectral types6
- x-ray binary stars6
- galaxies5
- wide-band photometry5
- h alpha photometry4
- infrared astronomy4
