Cosmic bubble NGC 6781
Stars such as our Sun do not contain enough mass to finish their lives in the glorious explosions known as supernovae. However, they are still able to salute their imminent demise into dense, Earth-sized embers called white dwarfs by first expelling colourful shells of gas known as planetary nebulae. This misnomer comes from the similarity in appearance of these spherical mass expulsions to giant planets when seen through small telescopes.
NGC 6781 is a nice representative of these cosmic bubbles. The planetary nebula lies a few thousand light-years away towards the constellation of Aquila (the Eagle) and is approximately two light-years across. Within NGC 6781, shells of gas blown off from the faint, but very hot, central star’s surface expand out into space. These shells shine under the harsh ultraviolet radiation from the progenitor star in intricate and beautiful patterns. The central star will steadily cool down and darken, eventually disappearing from view into cosmic oblivion.
This image was captured with the ESO Faint Object Spectrograph and Camera (EFOSC2) through three wide band filters (B, V, R) and two narrow-band ones (H-alpha, OIII). EFOSC2 is attached to the 3.6-metre telescope at ESO’s La Silla Observatory in Chile. EFOSC2 has a field of view of 4.1 x 4.1 arcminutes.
ESO
A proposito dell'immagine
Identificazione: | ngc6781-potw |
Tipo: | Osservazione |
Data di pubblicazione: | Giovedì 03 Dicembre 2009 23:21 |
Dimensione: | 1766 x 1766 px |
A proposito delll'oggetto
Formati delle immagini
Coordinate
Position (RA): | 19 18 28.01 |
Position (Dec): | 6° 32' 20.85" |
Field of view: | 4.64 x 4.64 arcminutes |
Orientazione: | Il Nord è a 1.1° a destra della verticale |
Colori e filtri
Banda | Telescopio |
---|---|
Ottico B | ESO 3.6-metre telescope EFOSC2 |
Ottico Oiii | ESO 3.6-metre telescope EFOSC2 |
Ottico V | ESO 3.6-metre telescope EFOSC2 |
Ottico H-alpha | ESO 3.6-metre telescope EFOSC2 |
Ottico R | ESO 3.6-metre telescope EFOSC2 |