Light Curve of AKO 9 in 47 Tucanae

In this diagramme are shown the light curves (change of light intensity with time) for the binary system AKO 9 (o) and two other stars (x) with constant brightness in the southern globular cluster 47 Tucanae.

The ultraviolet magnitude of AKO 9 was U ~ 18 at the time of the first observation. The subsequent rise was very fast: 2.1 magnitudes in 1 hour. It then remained constant for about 2 hours before increasing by another 0.5 mag.

The observations ended with the system in this bright state. It is not known if and when it reverted to its normal state. At the end of these observations, AKO 9 was the brightest ultraviolet source in the core of the cluster.

Credit:

ESO

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About the Image

Id:eso9703b
Type:Chart
Release date:15 January 1997
Related releases:eso9703
Size:771 x 554 px

About the Object

Name:47 Tucanae, AKO 9
Type:• Milky Way : Star : Grouping : Binary
• Milky Way : Star : Grouping : Cluster : Globular
• X - Stars
• X - Star Clusters
Distance:15000 light years

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