Some Cepheids have somewhat long period of varition, from several days to 100 days
For very long periods, for example 100 days, I might use same methods as Mira variables to determine maximum timing.
What methods are better to use for Cepheids that has periods from several days to weeks?
Usually I can get only sparse photometric data (1/day or less). How can I determine maximum timing from such sperse observations?
Seiichiro Kiyota, Japan