The binary second sequence in cluster colour–magnitude diagrams |
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Authors: | Jarrod Hurley & Christopher A Tout |
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Institution: | Institute of Astronomy, The Observatories, Madingley Road, Cambridge CB3 0HA |
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Abstract: | We show how the second sequence seen lying above the main sequence in cluster colour–magnitude diagrams results from binaries with a large range of mass ratios and not just from those with equal masses. We conclude that the presence of a densely populated second sequence, with only sparse filling in between it and the single star main sequence, does not necessarily imply that binary mass ratios are close to unity. |
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Keywords: | binaries: general galaxies: star clusters |
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