Hubble snaps images of a nebula within a star cluster

January 16th, 2009 - 3:51 pm ICT by ANI  

Washington, Jan 16 (ANI): The Hubble Space Telescope has snapped images of a unique planetary nebula, which is nestled inside a star cluster, 10,000 light-years away from Earth.

The Hubble image was taken in November 2008 with the Wide Field Planetary Camera 2.

The colors in the image represent a range of emissions coming from the clouds of the nebula: red represents nitrogen, green represents hydrogen, and blue represents oxygen.

The nebula, known as NGC 2818 is inside the open star cluster NGC 2818A. Both the cluster and the nebula reside over 10,000 light-years away, in the southern constellation Pyxis (the Compass).

NGC 2818 is one of very few planetary nebulae in our galaxy located within an open cluster.

Open clusters, in general, are loosely bound and they disperse over hundreds of millions of years. Stars that form planetary nebulae typically live for billions of years.

Hence, it is rare that an open cluster survives long enough for one of its members to form a planetary nebula.

This open cluster is particularly ancient, estimated to be nearly one billion years old.

The spectacular structure of NGC 2818 (also known as PLN 261+8.1) contains the outer layers of a sun-like star that were sent off into interstellar space during the stars final stages of life.

These glowing gaseous shrouds were shed by the star after it ran out of fuel to sustain the nuclear reactions in its core.

Planetary nebulae can have extremely varied structures. NGC 2818 also has a complex shape that is difficult to interpret.

However, because of its location within the cluster, astronomers have access to information about the nebula, such as its age and distance, which might not otherwise be known.

Planetary nebulae fade away gradually over tens of thousands of years. The hot, remnant stellar core of NGC 2818 will eventually cool off for billions of years as a white dwarf. (ANI)

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