The three generations of stars in NGC 2808

Astronomers were surprised when Hubble spied three generations of cluster stars in globular cluster NGC 2808. The discovery is far different from the standard picture of a globular cluster. For decades, astronomers thought that cluster stars formed at the same time, in the same place, and from the same material, and have co-evolved for billions of years.

Each point in this graph represents one star in NGC 2808. The vertical axis represents the brightness (as measured through Hubble's near-infrared F814W filter) of the stars (the brightest stars near the top). The horizontal axis represents the colours of the stars, with bluer stars to the left and redder to the right (blue magnitude minus near-infrared magnitude). The three coloured curved lines, red, green and blue, represent the three different stellar generations that are present in the globular cluster.

Credit:

European Space Agency, NASA, G. Piotto (University of Padua, Italy), A. Sarajedini (University of Florida, USA) and Martin Kornmesser (ESA/Hubble)

About the Image

Id:heic0708b
Type:Chart
Release date:2 May 2007, 15:00
Related releases:heic0708
Size:1996 x 1936 px

About the Object

Name:NGC 2808
Type:• Milky Way : Star : Grouping : Cluster : Globular
• X - Star Clusters Images/Videos
• X - Miscellaneous Images/Videos
• X - Illustration Images
Distance:30000 light years


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