How would I find data on the Luminosity of Cepheid variables?

[Da_Rex]

Hi,
I'm doing a project on Calculating the Hubble tension, and I had some trouble finding the Luminosity to period values of Cepheid variables in sites like Simbad and etc.

I was wondering if I could get data or would I have to make them myself?

 

[phyzguy]

I Google searched on "Cepheid variable database", and immediately found what you are looking for:
Within our galaxy: https://www.astro.utoronto.ca/DDO/research/cepheids/cepheids.html
Extragalactic: https://cepheids.konkoly.hu/about.php

 

[phyzguy]

For example, if you take the second one, go to "Database", and put it "M31", it returns a list of 2686 Cepheid variables in M31 with position, period, and magnitude.

Another example. Go to the first database, click on "physical data" and you will find a list of stars. Scroll down a ways to Delta Cephei, which is the original Cepheid variable, It has a period of 5.36 days and a visual magnitude of 3.95. Happy hunting!

205.0 Del Cep 5.366270 3.954