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I'm a highschool student and in the process of writing a research paper of deriving period-lumniosity relation of Cepheid variable independently of the pre-existing PL relation. Thus, I need to derive distance to each Cepheid variable independently by using, for example, trigonometric parallax and Baade-Wesselink method.

In the process of using Baade-Wesselink method, I need to calculate the change in angular diameter, which is represented by ∆θ. The question is, how can I derive that value given fluxes from different bands (V,B, etc.. I'm using the SIMBAD database currently).

Which definite equation do I need to use to derive it?

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    $\begingroup$ What exactly is the data you have? Do you only have only have the total flux of the star in various bands and not an image? Have you seen this paper? $\endgroup$ – zephyr Aug 10 '16 at 19:45
  • $\begingroup$ @zephyr Thank you for the reference. The paper is the one I was looking for. The data I have is lists of V-R values and uncertainties over the period. $\endgroup$ – 7_G.S.N Aug 11 '16 at 7:04

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