Radial Velocity Curves

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Jim</i>
<br />The use of two factors to determine the dynamics of a star system seems to add something to the result. And since it is available why not use the two redshift factors when doing spectral readings?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">Cosmological redshift is not a free parameter. It depends only on distance, and is negligible for double stars, so it offers no advantage. -|Tom|-

It may offere a slight advantage in that it adds to a redshift and subtracts from a blueshift. Also it reddens a spectrum a tiny bit and distance adds to the effects.