This is my favourite Carbon star image, one reason being that there are 2 Carbon stars in a beautiful H-alpha setting, both in the constellation Cygnus.
This is a 2-frame horizontal mosaic taken with the Hyperstar III and M25C OSC CCD. Each frame is 20 x 200-second subs.
The bright yellow star, one-third of the way down from the top and in the middle of the frame is 32 Cygni at magnitude 3.96. Move up a little from 32 Cygni and off to the left and you come to the first Carbon star which sits right next to a star of similar magnitude. This is U Cygni (magnitude 8.25) also designated SAO49477. Return to 32 Cygni, go as far up as you did for U Cygni, but this time move over to the right a similar distance and here you’ll find the second Carbon star, SV Cygni (magnitude 8.65), also designated HIP99310.
For orientation, the bright yellow star towards the bottom of the frame is 31 Cygni (SAO49377) at magnitude 3.80, and its accompanying blue star is 30 Cygni (SAO49332) at magnitude 4.80.