On Wed, 28 Mar 2007 00:40:56 +0100, OG wrote:

Androcles wrote:

Here's a real fluke, look, a huff-puff star just happens to have a Keplerian
orbit, found from it's velocity curve:
http://www.androcles01.pwp.blueyonde.../Analemmae.htm

What a strange coincidence, eh?
Perhaps the data was faked to make it look like a Keplerian orbit.

No, you just don't seem to understand that the velocity measured is
nothing to do with movement of the star as a whole for Cepheids.

You don't seem to have the faintest idea of what we're talking about...not that
Androcles does either.

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.

The error astronomers have been making is due to the fact that, according to
BaTh, 'ADoppler shift' of spectral lines increases with distance...yet they
have been assuming this is VDoppler shift, which in fact doesn't contribute a
significant effect in BaTh.
Thus the calculated velocity curves for any star are likely to be high by many
orders of magnitude.

(ADoppler and VDoppler are terms that George and I have been using to
discriminate between the bunching of pulsar pulses due to velocity and
acceleration of the source star as it orbits)



The velocity profile varies for different elements.
And it's nothing to do with an analemma either way.


"When a true genius appears in the world, you may know
him by this sign, that the dunces are all in confederacy against him."
--Jonathan Swift.