• Source: Bipolar nebula

A bipolar nebula is a type of nebula characterized by two lobes either side of a central star. About 10-20% of planetary nebulae are bipolar.




Formation


Though the exact causes of this nebular structure are not known, it is often thought to imply the presence of a binary central star with a period of a few days to a few years. As one of the two stars expelled its outer layers, the other disrupted the outflow of material to form the bipolar shape.




Examples



Homunculus Nebula around Eta Carinae
Hubble 5
M2-9 – The Wings of a Butterfly Nebula
OH231.8+4.2 – The Calabash Nebula or Rotten Egg Nebula
Mz3 (or Menzel 3) – The Ant Nebula
CRL 618 - The Westbrook Nebula
CRL 2688 – The Egg Nebula
HD 44179 – The Red Rectangle Nebula
MyCn18 – The Engraved Hourglass Nebula
He2-104 – The Southern Crab Nebula
The Boomerang Nebula
NGC 2346 – Also known as the Butterfly Nebula
NGC 6302 – The Bug or Butterfly Nebula
KjPn 8 Nebula – The largest (in angular size) bipolar planetary nebula.




References






See also


Bipolar outflow
Stellar evolution

Kata Kunci Pencarian:

• Menzel 3
• Nebula planeter
• Nebula Dumbbell Kecil
• Nebula Cincin
• Nebula Mata Kucing
• Nebula Laba-laba Merah
• Eta Carinae
• HD 168625
• Objek Herbig-Haro
• Kondrul
• Bipolar nebula
• M2-9
• Homunculus Nebula
• Mz 3
• Boomerang Nebula
• Little Dumbbell Nebula
• Red Square Nebula
• Butterfly Nebula
• Egg Nebula
• Protoplanetary nebula