Unexplained Brightening of AKO 9 in 47 Tucanae

This is a reproduction of two images obtained in late 1996 with the Hubble Space Telescope (HST) , showing the field of the variable star AKO 9 at the centre of the southern globular cluster 47 Tucanae .


This star brightened by more than 2 magnitudes (a factor of seven) in less than 1 hour. Left: the first frame; right: the last frame in a series of 15 exposures, obtained during a period of just over 4 hours.


Yhe field of each image measures 3.9 arcsec x 3.9 arcsec. North is up and East is to the left.
No other star among the > 30,000 studied was found to have such a large amplitude.

Credit:

ESO

About the Image

Id:eso9703a
Type:Observation
Release date:15 January 1997
Related releases:eso9703
Size:3284 x 1629 px

About the Object

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

Image Formats

Large JPEG
1.7 MB
Screensize JPEG
315.8 KB

Colours & filters

BandWavelengthTelescope
Ultraviolet
U
300 nmHubble Space Telescope
WFPC2

Exposure time: 4350s

 

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