Abstract
Analysis of the available observational data for the α-Persei cluster members shows that rotation effects on the intermediate-band indices c1 and (u-b) are considerable. In c1, rotation produces a reddening of 0.040 magnitudes per 100 km s-1 In (u-b) the effect for B stars is found to be 0.06 magnitudes per 100 km s-1 ofV sin i.
The binaries and peculiar stars are found to behave differently in the colour excess (due to rotation) versusV sin i diagrams. These empirical effects can be utilised to recalibrate these colour indices and also to separate members that are either chemically peculiar or in binary systems.
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Rajamohan, R., Mathew, A. Effects of rotation on the colours and line indices of stars 1. The alpha Persei cluster. J. Astrophys. Astr. 9, 107–116 (1988). https://doi.org/10.1007/BF02715687
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DOI: https://doi.org/10.1007/BF02715687