Sunday night the sky was clear for the fist time in months and my first attempt at the bubble nebula with my WilliamOptics FLT91. Unfortunatly I got my setup together later than I should have, and hence I didn’t let my camera cool down enough so in the bottom half i have round artifacts that i don’t know how to get rid of, I am semi happy with the image but for now it’s the best I can do. If anyone has a suggestion how to get rid of those blotches post processing please let me know.
Caldwell 11 is an
emission nebula — a cloud of gas that gives off its own light — and actually includes not just the bubble but all the gas surrounding it as well. Stars shine throughout the field like specks of glitter, adding to the nebula’s stunning composition.Also known as NGC 7635, the Bubble Nebula stretches 6 light-years across and is located roughly 7,000 light-years away. Within this bubble lies a
magnitude-8.7, 15-solar-mass star — the creator of the glowing orb around it. A long time ago, the star began blowing a hole in the surrounding gas and dust of Caldwell 11 through radiation pressure to form the bubble shape, which has grown over time.Caldwell 11’s bubble can be thought of as a continuously receding shock wave emanating from that star, which is positioned in the upper left of the bubble. The star’s stellar wind reaches 4 million miles per hour, carrying particles from the star’s surface and helping to propel the “shock wave” outward. The result ends up looking something like a
planetary nebula, in which a star’s outer layers expand outward, but it is in fact gas and dust from the surrounding nebula that’s being pushed away from the star. This surrounding material is more dense to one side of the star, so the stellar wind meets greater resistance and progresses less in that direction, offsetting the central star from the geometric center of the bubbl.e,
Comments