Difference in star colors

[shaneaust]

Hi all:

I took the attched frame from a vid I shot last night with a Toucam. I simply picked out a spot in the sky with my scope, plugged in and adjusted the webcam and started recording. The area of the sky that I picked up on was about 120 degrees in azimuth and ~ 40 degrees altitude from my position.

When I processed the vid into individual frames and used Paint Shop Pro to (only) adjust brightness and contrast, I noted what I hope appears in the attached shot - stars/objects of various colors, mainly white, blue and red.

What do the differences in colors mean in terms of the object(s)??

[Merlin66]

Difficult to comment without seeing other frames from the video. My first impression is hot pixels in the camera rather than star images. A 1/60 sec exposure generally shows very few stars and I would have expected to see larger images if it were a star.
Do you have similar frames? have you stacked say 20 + do they show a "build up" of star images??

[shaneaust]

Thanks for the suggestion - I've attached a stacked jpg composed of about 25 images...if I reemmber correctly, I had exposure time set at about 1/25 sec last night when the vid was taken.

[shaneaust]

Hi:
I left another image on this thread of some stacked vid frames....

[Merlin66]

I'm assuming it's a standard webcam set-up, no long exposure mods. The dark bands at the edges... maybe due to registration between the images, but I still see a "dark" frame of hot pixels which have now been added to make them brighter!!! Take a proper dark frame ( cover the lens) and see if it looks similar. When this is subtracted from your exposure, what ever is left should be an image of the sky.
I think the std webcam is very limited for general sky shots, maybe someone else can comment.