GCVS Help

Forums Variable Stars GCVS Help

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  • #574406
    Eliot Hall
    Participant

    A few months back I created a site to predict binary star eclipses – https://eclipsingstars.org/

    Reusing the same code I have created another.  This time for pulsating stars – https://pulsatingstars.org/.  Whilst it is up and working I still have a few minor issues to resolve (mostly website copy).

    However I am having a struggle interpreting the GCVS catalog data for pulsating stars:

    • I am assuming that the epoch and period combination predicted the minima for eclipsing binary stars, and the maxima for pulsating stars.
    • M-m/D field is a percentage of the period that the eclipse occurs for binaries (manly EB types).  What does it represent for pulsating stars – I would have assumed this is a continuous process and would look more or less sinusoidal, but there are pulsating stars with a value in this field e.g. YZ Boo and TW Her.
    #581396
    Robin Leadbeater
    Participant

    These types of star have have distinctly sawtooth pulsations with the rise time shorter than the fall. eg YZ Boo has a catalogued rise time of 31% which seems to tally with the actual light curve

    EDIT:from the catalogue field descriptions

    Rise_Eclipse_Time
    This parameter contains either the rise time (M-m) for intrinsic variables, or the duration of the eclipse (D) for eclipsing binaries, both given as a percentage of the period value for the star. These values help to define the shape of the light curve.

    Cheers

    Robin

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