Massive stars in Cyg OB2.
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https://b2find.eudat.eu/dataset/8c541433-2863-5d7b-ac75-6a2115d3f6a0
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The galactic association Cygnus OB2, which contains heavily reddened O and B stars, has been studied using CCD UBV photometry and spectroscopy. The file "mt91.dat" contains...
