Elephant's Trunk Nebula

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Elephant's Trunk Nebula
Emission nebula
Spitzer Space Telescope photo of the nebula
Observation data
Distance2,400 ly
ConstellationCepheus
See also: Lists of nebulae

The Elephant's Trunk Nebula is a concentration of

light years away from Earth.[1] The piece of the nebula shown here is the dark, dense globule IC 1396A; it is commonly called the Elephant's Trunk nebula because of its appearance at visible light wavelengths, where there is a dark patch with a bright, sinuous rim. The bright rim is the surface of the dense cloud that is being illuminated and ionized by a very bright, massive star (HD 206267) that is just to the east of IC 1396A. (In the Spitzer Space Telescope view shown, the massive star is just to the left of the edge of the image.) The entire IC 1396 region is ionized by the massive star, except for dense globules that can protect themselves from the star's harsh ultraviolet rays.[citation needed
]

The Elephant's Trunk Nebula is now thought to be a site of star formation, containing several very young (less than 100,000 yr) stars that were discovered in infrared images in 2003. Two older (but still young, a couple of million years, by the standards of stars, which live for billions of years) stars are present in a small, circular cavity in the head of the globule. Winds from these young stars may have emptied the cavity.[citation needed]

The combined action of the light from the massive star ionizing and compressing the rim of the cloud, and the wind from the young stars shifting gas from the center outward lead to very high compression in the Elephant's Trunk Nebula. This pressure has triggered the current generation of protostars.[2][3]

Gallery

  • Captured in classic Hubble Palette (Ha/OIII/SII) using a 127mm refractor telescope
    Captured in classic Hubble Palette (Ha/OIII/SII) using a 127mm refractor telescope
  • Captured in hydrogen alpha using a 102mm telescope
    Captured in hydrogen alpha using a 102mm telescope
  • Captured in hydrogen alpha and oxygen
    Captured in
    hydrogen alpha
    and oxygen
  • Ha+OIII+SII Hubble palette modified
    Ha+OIII+SII Hubble palette modified
  • Widefield view of the IC1396 nebula in SHO Hubble palette
    Widefield view of the IC1396 nebula in SHO Hubble palette
  • Close-up on the nebula
    Close-up on the nebula

See also

References

External links