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ASTROSAT observed new population of Ultraviolet Stars in the Globular Cluster NGC 2808

ASTROSAT observed new population of Ultraviolet Stars in the Globular Cluster NGC 2808

Astronomers from Thiruvananthapuram and Mumbai have identified a new population of ultraviolet stars in the globular cluster NGC 2808 using the Indian multi-wavelength space observatory AstroSat, launched in September 2015.

ASTROSTAT

AstroSat is India’s dedicated multi-wavelength space observatory which endeavours for a more detailed understanding of our universe.

ASTROSAT observes the universe in the optical, ultraviolet, low and high energy X-ray regions of the electromagnetic spectrum. Major astronomy Institution and some Universities in India are participating in these observations.

NGC 2808

NGC 2808 is one of the most massive globular clusters that we know of, and is located at a distance of 47,000 light years from us.

This cluster was observed by the team of researchers using the UltraViolet Imaging Telescope (UVIT) on-board AstroSat.

Globular Clusters

Globular clusters are collections of thousands to millions of stars, moving as one unit. These stars are tightly held together by gravity of the cluster itself, and are believed to have formed together at roughly the same time. Some globular clusters could be among the oldest objects in our Milky Way, which hosts over 150 of them.

Since a globular cluster contains stars with a variety of masses but with similar chemical composition, a snapshot of it could reveal stars of different masses at different stages of their evolution. The Sun will, after 5 billion years, expand to become a red giant star and go through some of these stages.

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