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Astronomy

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  • $\begingroup$ Putting the diagramme and the question into slightly more context would be really helpful. Did you consider it being theoretical curves? $\endgroup$
    – planetmaker
    Commented Jan 8 at 19:46
  • $\begingroup$ If they are theoretical curves, my question is what formula is used. There needs to be some relation to how to compute the length of baseline for the particular angular diameter $\theta$. $\endgroup$
    – Elena Greg
    Commented Jan 9 at 7:33
  • $\begingroup$ Did you look at the extensive explanation material the site links? Why or how wasn't that helpful? $\endgroup$
    – planetmaker
    Commented Jan 9 at 8:01
  • $\begingroup$ I quickly went through it and did not find it. $\endgroup$
    – Elena Greg
    Commented Jan 9 at 10:28
  • $\begingroup$ Stellar interferometry is a cool way to measure the diameters of stars when we can't directly image them. cf. What equipment and techniques were used to study Betelgeuse's diameter in 1920? I can't give you a formula, but I'll be it can be derived for a uniform disk and two slits. If the start was a point, the visibility would be flat at 1.0 (perfect constructive and destructive interference) but the finite diameter has a "smearing" effect that makes the max/min ratio drop because the angle from one part of the star is producing a maximum $\endgroup$
    – uhoh
    Commented Jan 10 at 12:04