On 28 Mar, 01:50, HW@....(Henri Wilson) wrote:
....
Whether or not cepheids are really huff-puff stars doesn't matter. We say their
brightness variations are due to c+v effects caused by their surfaces moving in
and out. A brightess curve produced that way is likely to be similar to that
for a star in elliptical orbit.

What ?????

For years you have been saying that Cepheids were plain
constant-luminosity stars and the variation was due to
c+v effects because they are in binary systems that have
not been recognised as such.

If you are now switching to say they are single stars, why
on Earth would your software be modelling binary systems
and restricting the solutions to Keplerian orbits when the
motion of the surface is due to internal pressure?

I think it is my turn to say you are getting very confused
Henry.

George