NGC 7635, also known as the Bubble Nebula, Sharpless 162, or
Caldwell 11, is an H II region emission nebula in the
constellation Cassiopeia. It lies close to the direction of
the open cluster Messier 52. The "bubble" is created by the
stellar wind from a massive hot, magnitude young central star,
SAO 20575 (BD+60°2522).
The nebula is near a giant
molecular cloud which contains the expansion of the bubble
nebula while itself being excited by the hot central star,
causing it to glow.It was discovered in 1787 by William
Herschel. The star BD+60°2522 is thought to have a mass of
about 44 M☉.
[Wikipedia] |
