Re: GSC 748-1618 V-I

[Arne Henden <aah@nofs.navy.mil>]

As mentioned in the later email, larger (V-I) means redder
color; since minimum is around phase 0.75 in the current
system, this table shows the star getting redder near
minimum.  I'd like to see the equivalent data at maximum.
   Contrary to eclipsing binaries, the normal convention
is to place the maximum at phase 0.0/1.0, primarily because
this feature is the easiest to measure on pulsating
variables.
Arne

Michael Koppelman wrote:
> I started getting Ic data last night and using the Henden sequence it's 
> going like this:
> 
> Phase     V-I
> 0.63     0.78
> 0.64     0.78
> 0.65     0.80
> 0.66     0.79
> 0.67     0.80
> 0.68     0.81
> 0.69     0.80
> 0.70     0.81
> 0.71     0.83
> 0.72     0.83
> 0.73     0.83
> 0.74     0.83
> 0.75     0.83
> 0.76     0.84
> 0.77     0.85
> 
> As the star is going from maximum (at phase 0.5) to minimum (at phase 
> 1.0), it is getting bluer. That seems contrary to what Patrick said 
> earlier. Am I reading this wrong?
> 
> Michael Koppelman
> 
> 
> 
>