UV photometry of 23 Be stars in NGC 663 reveals an excess in 19, which the authors interpret as hot sdOB companions, suggesting most Be stars there formed via binary mass transfer.
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AstroSat/UVIT Study of NGC 663: First detection of Be+sdOB systems in a young star cluster
UV photometry of 23 Be stars in NGC 663 reveals an excess in 19, which the authors interpret as hot sdOB companions, suggesting most Be stars there formed via binary mass transfer.