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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.
ESO
À propos de l'image
| Identification: | eso9703a |
| Type: | Observation |
| Date de publication: | 15 janvier 1997 |
| Communiqués de presse en rapport: | eso9703 |
| Taille: | 3284 x 1629 px |
À propos de l'objet
| Nom: | 47 Tucanae, AKO 9 |
| Type: | Milky Way : Star : Type : Variable Milky Way : Star : Grouping : Cluster : Globular |
| Distance: | 15000 années lumière |
| Catégorie: | Star Clusters Stars |
Couleurs & filtres
| Domaine | Longueur d'onde | Télescope |
|---|---|---|
| Ultraviolet U | 300 nm | Hubble Space Telescope WFPC2 |
Exposure time: 4350s