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
Om billedet
Id: | eso9703a |
Type: | Observation |
Udgivelsesdato: | 15. januar 1997 |
Relaterede pressemeddelelser: | eso9703 |
Størrelse: | 3284 x 1629 px |
Om objektet
Navn: | 47 Tucanae, AKO 9 |
Type: | Milky Way : Star : Type : Variable Milky Way : Star : Grouping : Cluster : Globular |
Afstand: | 15000 lysår |
Kategori: | Star Clusters Stars |
Farver & filtre
Bånd | Bølgelængde | Teleskop |
---|---|---|
Ultraviolet U | 300 nm | Hubble Space Telescope WFPC2 |
Exposure time: 4350s