Why are the 'Fixed Stars' so FIXED?

On Sun, 8 Jul 2007 23:48:25 +0100, "George Dishman"
wrote:


"Henri Wilson" HW@.... wrote in message
.. .


Maybe Jerry wouldn't since again you are contradicting
yourself. Ballistic theory says both luminosity (photon
rate) and frequency (wavecrest rate) get altered by the
same ratio.

No George, you left out the factor 'K'.

No, I was drawing a distinction between "Ballistic
theory" above and your bodge next.

For a spectroscopic speed of 300km/s the
luminosity is changed by 0.001 mag so for typical Cepheid
variations, the speeds are way too high. You invented the
silly "K" factor to reduce the speed measurement by
effectively reducing the ADoppler contribution to the
Doppler to a negligible level.

That's correrct.

See, you only needed to read a few more lines.

George, George, let me explain.
One thing we know is the observed magnitude change.
When matching a curve, that is the main criterion.
I then adjust eccentricity and yaw angle to get the right curve shape.

What I get out of this is a figure representing (maximum orbit speed x distance
x cos(pitch angle).

If I plug in the known Hipparcos distance, I invariably require a very small
velocity. It is more likely that the extinction distance is considerably less
than the known one and the velocity is larger. I have no way of determining
which is true. ..so I cannot really give you a value for 'K'. I can only tell
you that there is good reason to believe it exists and has a value 1.

That solves you scaling
problem but it means the spectroscopic speed is now
accurate other than time of arrival. That is, the peak
to peak velocity is right but the X-axis of a plot is
slightly squeezed and stretched.

No it doesn't

Yes it does.

You of all people should know that a.sin(xt) is in phase with bsin(xt)

We are comparing A*sin(w*t) with A*sin(w*t')
where t' is a cyclic function of t.

No we're not. Both frequencies are the same.

The peak
to peak amplitude remains 2*A but the shape
will be changed. The peak to peak spectroscopic
speed variation depends only on A so phase is
of no relevance to this discussion.

That's the problem with ad hoc bodges Henry, add too
many they start to get in each other's way.

The problem, George, is that I have a much better understanding of maths
than
you do.

ROFL, Henry you can't even follow the discussion.'

You just made an embarrassing blunder.


George




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