The Binary Second Sequence in Cluster Colour--Magnitude Diagrams

Details The Binary Second Sequence in Cluster Colour--Magnitude Diagrams The Binary Second Sequence in Cluster Colour--Magnitude Diagrams

1998-07-10

arxiv.org/abs/astro-ph/9807108v1

Astronomy and Astrophysics

Astrophysics

Accepted to MNRAS. 5 Pages including 3 figures

Scientific paper

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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