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Астронет: Астрономическая картинка дня NGC 7293: туманность Улитка http://variable-stars.ru/db/msg/1772464/eng |
Credit & Copyright: Ignacio Diaz Bobillo
Explanation:
A mere seven hundred light years from Earth, toward the constellation
Aquarius,
a sun-like star is dying.
Its last few thousand years have produced the
Helix
Nebula (NGC 7293), a well studied and nearby example of a
Planetary
Nebula, typical of this final phase of stellar evolution.
A total of 90 hours of exposure time have gone in to creating
this
expansive view of the nebula.
Combining narrow band image data from emission lines of hydrogen atoms
in red and oxygen atoms in blue-green hues,
it shows remarkable details of the
Helix's brighter inner region about 3
light-years across.
The white dot at the Helix's center is this Planetary Nebula's hot,
central
star.
A simple looking nebula at first glance,
the Helix is now understood to have a surprisingly
complex
geometry.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.