The planetary nebula around Sakurai's Object

These CCD images show Sakurai's new star and the planetary nebula surrounding it. The images were obtained with the CCD Camera at the Dutch 0.9-metre telescope at the ESO La Silla Observatory by Hilmar Duerbeck (European Southern Observatory). Each of the four fields measures about 1.4 x 1.4 arcmin. North is up and East is to the left.

The upper-left image was taken through a narrow-band filter (spectral interval 660.9 - 668.8 nm) in which only light coming from the star (the 'spectral continuum') is recorded. The image on the upper-right was taken through a narrow-band filter centred on the hydrogen H-alpha-line (652.5 - 660.7 nm). It shows that the hydrogen in the planetary nebula around the star radiates strongly.

The shape and dimension of the nebula is much better defined in the lower-right image, which was produced by subtracting the continuum image from the H-alpha image, leaving only the emission of the nebula. It has an almost circular shape - with the strongest emission in the north-west quadrant - and a diameter of about 32 arcsec. The nebula also appears to have the same shape and dimension in the fourth (lower-left) image taken through another narrow band-filter (497.9 - 503.5 nm) which isolates the green light associated with the "forbidden" emission lines of doubly ionized oxygen ([O III]).

Crédit:

ESO

À propos de l'image

Identification:eso9619a
Type:Observation
Date de publication:7 mars 1996
Communiqués de presse en rapport:eso9619
Taille:532 x 530 px

À propos de l'objet

Nom:Sakurai's Object
Type:Milky Way : Nebula : Type : Planetary
Milky Way : Star : Type : Variable : Nova
Distance:10000 années lumière
Catégorie:Nebulae
Stars

Formats des images

Grand JPEG
185,0 Kio
JPEG taille écran
388,5 Kio

Fonds d'écran

1024x768
338,5 Kio
1280x1024
485,8 Kio
1600x1200
616,7 Kio
1920x1200
651,8 Kio
2048x1536
850,2 Kio

Couleurs & filtres

DomaineLongueur d'ondeTélescope
Visible
R
665 nmDutch 0.9-metre telescope
Visible
H-alpha
656 nmDutch 0.9-metre telescope
Visible
OIII
501 nmDutch 0.9-metre telescope