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## Summary:

- If given a set of data points for the magnitude of a cepheid variable at a certain time, how can we use fourier series to find the period of the cepheid variable from the equation of the light curve? Where can I find data points for M31_V1?

If given a set of data points for the magnitude of a cepheid variable at a certain time (JD), how can we use fourier series to find the period of the cepheid variable?

I'm trying to do a math investigation (IB math investigation) on finding the period of the cepheid variable M31_V1 from data points for the magnitude of the cepheid variable at a certain time (JD). However, to find the equation of the light curve using fourier series, the period must be given already right? How can I find the period then?

Also, I'm trying to plot the data points from the AAVSO (https://www.aavso.org/data-download/aavsodata_5f913c1d4f3f0.txt), but it seems like the points are not forming a curve. Can I find data points for the magnitude and JD of M31_V1 anywhere else?

Thank you!

I'm trying to do a math investigation (IB math investigation) on finding the period of the cepheid variable M31_V1 from data points for the magnitude of the cepheid variable at a certain time (JD). However, to find the equation of the light curve using fourier series, the period must be given already right? How can I find the period then?

Also, I'm trying to plot the data points from the AAVSO (https://www.aavso.org/data-download/aavsodata_5f913c1d4f3f0.txt), but it seems like the points are not forming a curve. Can I find data points for the magnitude and JD of M31_V1 anywhere else?

Thank you!