Elephant's Trunk nebula

Elephant's Trunk nebula

The Elephant's Trunk nebula is a concentration of interstellar gas and dust in the star cluster IC 1396 and ionized gas region located in the constellation Cepheus about 2,400 light years away from Earth [cite journal
last = Matthews
first = H. I.
authorlink = H. I. Matthews
title = High resolution radio observations of bright rims in IC 1396
journal = Astronomy and Astrophysics
year = 1979
volume = 75
pages = 345-350
url = http://adsabs.harvard.edu/abs/1979A%26A....75..345M
] . The piece of the nebula shown here is the dark, dense globule IC 1396A; it is commonlycalled the Elephant Trunk nebula because of its appearance at visible wavelengths,where it is a dark patch with a bright, sinuous rim. The bright rim is the surface ofthe dense cloud that is being illuminated and ionized by a very bright, massive star thatis just to the west of IC 1396A. (In the Figure above, 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 ultravioletrays.

The Elephant Trunk nebula is now thought to be 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 billions of years) stars are present ina small, circular cavity in the head of the globule. Winds from these young stars may have emptied the cavity.

The combined action of the light from the massive star ionizing and compressingthe rim of the cloud, and the wind from the young stars shifting gas from the centeroutward lead to very high compression in the Elephant Trunk nebula. This pressurehas triggered the current generation of protostars.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • List of diffuse nebulae — Emission and reflection nebulae= * Barnard s Loop * Boomerang Nebula * Bubble Nebula * Bubble Nebula in Barnard s Galaxy * California Nebula * Cave Nebula * Corona Australis Nebula * Cone Nebula * Crescent Nebula * Double Helix Nebula * Eagle… …   Wikipedia

  • December 2003 — December 2003: January – February – March – April – May – June – July – August – September – October – November – December – → Events See also: 2004 Canadian Federal Election 2004 Taiwan Presidential Election 2004 U.S. Presidential Election Bloo …   Wikipedia

  • December 18, 2003 — December 18, 2003= *NASA announces that the new name for the Space Infrared Telescope Facility will be the Spitzer Space Telescope (after the late Dr. Lyman Spitzer, Jr.). This coincides with the release of the telescope s first images, which… …   Wikipedia

  • Elefantenrüsselnebel — Datenbanklinks zu Elefantenrüssel Nebel / IC 1396A Globule Elefantenrüsselnebel / IC 1396A …   Deutsch Wikipedia

  • Elefantenrüssel-Nebel — Datenbanklinks zu Elefantenrüssel Nebel / IC 1396A Globule …   Deutsch Wikipedia

  • IC 1396A — Datenbanklinks zu Elefantenrüssel Nebel / IC 1396A Globule …   Deutsch Wikipedia

  • Van den Bergh 142 — Datenbanklinks zu Elefantenrüssel Nebel / IC 1396A Globule …   Deutsch Wikipedia

  • VdB 142 — Datenbanklinks zu Elefantenrüssel Nebel / IC 1396A Globule …   Deutsch Wikipedia

  • List of minor Star Wars characters — This article is about minor characters in the fictional Star Wars universe, who do not fit into any other category.AlisiaAlisia is a female Gran who works as a station nurse in the Med Center of Tansarii Point Station. She and a 2 1B Surgical… …   Wikipedia

  • H II region — An H II region (also known as emission nebula) is a cloud of glowing gas and plasma, sometimes several hundred light years across, in which star formation is taking place. Young, hot, blue stars which have formed from the gas emit copious amounts …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”