Effects of rotation on the colours and line indices of stars 1. The alpha Persei cluster |
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Authors: | R Rajamohan Annamma Mathew |
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Institution: | (1) Indian Institute of Astrophysics, 560034 Bangalore |
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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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Keywords: | stars rotation stars colours star clusters individual |
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