Sheeny,
I really like the way you have presented the proms, they look fantastic. Well Done.
I am no expert on this topic but Sol is a Sun. The Sun is the closest one to us and although other stars are also suns, their distance makes them stars, so I doubt there will be much confusion if you use the term sun. If someone says the Sun I rarely (read never) think hmm does he mean Sol or Sirius :-)
In regards to the lines. Which version of the DMK 41 are you using USB or Firewire? If USB make sure that you have the camera in a port all on its own, dont use a hub, try to use one cable lenght with no extensions and also ensure that no other USB devices are plugged into another USB port from the same pair.
If the lines are consistently in the same columns it could be a problem with the ccd (some cameras often have a dead line or two) have you tried doing flats? Do you see the lines then (maybe vary the gamma from low to high to see if they are visible and always in the same spot).
Sorry if this has been covered in another thread.
Still fantastic images well done.
Bill D