IC 4634
| Planetarischer Nebel IC 4634 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops mit Linienfilter. | |
| AladinLite | |
| Sternbild | Schlangenträger |
| Position Äquinoktium: J2000.0 | |
| Rektaszension | 17h 01m 33,6s [1] |
| Deklination | −21° 49′ 33″[1] |
| Erscheinungsbild | |
| Scheinbare Helligkeit (visuell) | 10,9 mag |
| Scheinbare Helligkeit (B-Band) | 10,7 mag |
| Winkelausdehnung | 0,4 [2] |
| Zentralstern | |
| Bezeichnung | HD 153655 |
| Physikalische Daten | |
| Entfernung | 8.811 ± 900 Lj |
| Geschichte | |
| Entdeckung | Williamina Fleming |
| Datum der Entdeckung | 1894 |
| Katalogbezeichnungen | |
| IC 4634 • PK 000+12 1 • PN G000.3+12.2 • ESO 587-1 • Hen 2-189 | |
IC 4634 ist ein Planetarischer Nebel im Sternbild Schlangenträger am Südsternhimmel, der schätzungsweise 7.500 Lichtjahre von der Sonne entfernt ist. Er hat eine punktsymmetrische, s-förmige Struktur, worin seine innere Hülle sich mit 20 km/s ausbreitet.[3] Die innere Hülle zeigt eine intensive H-alpha-Emission, während die S-förmigen Bänder eine NII-Emissionlinie aufweisen.[4]
Entdeckt wurde das Objekt 1894 von der amerikanischen Astronomin Williamina Fleming.[5]
Weblinks
- astronews.com: Bild des Tages 18. Mai 2012
- IC4634’s Glowing Waves
- Simbad
Einzelnachweise
- ↑ NASA/IPAC EXTRAGALACTIC DATABASE
- ↑ SEDS: IC 4634
- ↑ Martin A. Guerrero, Luis F. Miranda, You-Hua Chu: Multiple Point-Symmetric Ejections in IC 4634, arxiv:astro-ph/0310370
- ↑ O. Toledano et al.: A Detailed Kinematical Study of the Point-Symmetric Planetary Nebula IC4634, bibcode:2003IAUS..209..543T.
- ↑ Seligman
Auf dieser Seite verwendete Medien
Autor/Urheber: ESA/Hubble and NASA, Lizenz: CC BY 3.0
This striking Hubble image of the planetary nebula IC 4634 reveals two shining, S-shaped ejections from a dying star. This star, awash in glowing material at the centre of the picture, bloated as it aged and launched its outer layers off into space. The star’s very hot, exposed core has since beamed intense ultraviolet radiation at these lost shells of gas, making them glow in rich colours.
This process has been far from orderly or calm, however, as revealed by the distinct, separate waves of thrown-off gases. One is more distant and therefore was spewed first, followed by a more recently ejected tide of matter that formed the tighter S-shape. The result is remarkably symmetric on each side of the central star.
The NASA/ESA Hubble Space Telescope’s Wide Field Planetary Camera 2 (WFPC2) captured this image of IC 4634, which is found more than about 7500 light-years away in the constellation of Ophiuchus (the Serpent Holder). IC 4634 and other objects like it are known as planetary nebulae due to their appearance through early telescopes as rounded, faintly luminous discs similar to the distant planets Uranus and Neptune. The picture was created from images through five different filters (F487N, F502N, F574M, F656N and F658N) that captured light emitted by different elements in the gaseous features. The total aggregate exposure time was 4000 seconds and the field of view is just 29 arcseconds across.