• Effects of rotation on the colours and line indices of stars 1. The alpha Persei cluster

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      https://www.ias.ac.in/article/fulltext/joaa/009/02/0107-0116

    • Keywords

       

      stars, rotation; stars, colours; star clusters, individual

    • 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.

    • Author Affiliations

       

      R. Rajamohan1 Annamma Mathew1

      1. Indian Institute of Astrophysics, Bangalore - 560034
    • Dates

       
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