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 |  Θέμα: A Bubble in Cygnus 18.11.08 22:35 | |
| The Bubble Nebula
Adrift in the rich star fields of the constellation Cygnus, this lovely, symmetric bubble nebula was only recently recognized and may not yet appear in astronomical catalogs.
In fact, amateur astronomer Dave Jurasevich identified it as a nebula on July 6 in his images of the complex Cygnus region that included the Crescent Nebula (NGC 6888).
He subsequently notified the International Astronomical Union. Only eleven days later the same object was independently identified by Mel Helm at Sierra Remote Observatories, imaged by Keith Quattrocchi and Helm, and also submitted to the IAU as a potentially unknown nebula.
Their final composite image is seen here, including narrow-band image data that highlights the nebula's delicate outlines.
What is the newly recognized bubble nebula?
Like the Crescent Nebula itself, this cosmic bubble could be blown by winds from a massive Wolf-Rayet star, or it could be a spherically-shaped planetary nebula, a final phase in the life of a sun-like star.
Image Credit & Copyright: Keith Quattrocchi, Mel Helm
Έχει επεξεργασθεί από τον/την Admin στις 09.09.10 11:13, 2 φορές συνολικά | |
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Admin
Admin
Αριθμός μηνυμάτων : 8056
Registration date : 10/07/2008
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Admin
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Αριθμός μηνυμάτων : 8056
Registration date : 10/07/2008
| | Θέμα: Απ: A Bubble in Cygnus 09.09.10 11:12 | |
| Irregular Galaxy NGC 55 Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape. Cataloged as NGC 7635, it is also known simply as The Bubble Nebula. Although it looks delicate, the 10 light-year diameter bubble offers evidence of violent processes at work. Above and right of the Bubble's center is a hot, O-type star, several hundred thousand times more luminous and approximately 45 times more massive than the Sun. A fierce stellar wind and intense radiation from that star has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud. The intriguing Bubble Nebula lies a mere 11,000 light-years away toward the boastful constellation Cassiopeia. A false-color Hubble palette was used to create this sharp image and shows emission from sulfur, hydrogen, and oxygen atoms in red, green, and blue hues. The image data was recorded using a small telescope under clear, steady skies, from Mount Wilson Observatory. Credit & Copyright: Dave Jurasevich (Mount Wilson Observatory)  | |
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