Causes for shifted H-alpha spectrum

[KickLaBuka]

If someone would please direct me to some reading material: What are the different causes for red-shift? I heard once that there were seven known.

Guesses:
distance
charge density
velocity
various heliopauses bending it
temperature

[Osmosis]

KickLaBuka, You may want to get Alton Arp's book, "Seeing Red".

[MGmirkin]

KickLaBuka, You may want to get Alton Arp's book, "Seeing Red".

Assume you meant Halton Arp. ;o]

As mentioned elsewhere, I think, the Wolf Effect may be another method of spectral shift.

http://www.plasma-universe.com/index.php/Wolf_effect

Plasma Redshift is a theoretical redshift mechanism as well...

http://www.plasma-universe.com/index.ph ... a_redshift

I seem to recall there was some list of other options I'd run across at some point in the past, but I don't recall where. Many of them were quite speculative, however...

Regards,
~Michael Gmirkin

[Osmosis]

My bad-Halton Arp. His book is right here, in plain sight.

[KickLaBuka]

just finished the introduction. This book wasn't at my local library.

[james weninger]

If someone would please direct me to some reading material: What are the different causes for red-shift? I heard once that there were seven known.

Guesses:
distance
charge density
velocity
various heliopauses bending it
temperature

Don't forget magnetism! The article on magnetars (Scientific American vol 14 number 4 special edition "The Secret Lives of Stars" 2004) shows how strong magnetic fields can cause light waves to change speed and wavelength.

Here is why that is interesting to me:
I say "The sun is charged and spiraling through the magnetic field of star X'
You say "star X is to far away to affect us magnetically"
I say "how do you know it is too far away?"
You say "It's redshift tells us so"
I say "The very fact that star X has a magnetic field strong enough to control sun's motion means we can least trust the redshift of that star"

In short, the star(s) that has the most influence on the sun will be the star we will be most wrong about in terms of distance and radial velocity.