Exosat observations of the ring nebula NGC 6888 and HD 192163

A 25-hr exposure of the ring nebula NGC 6888 was obtained with the Exosat X-ray observatory. X-ray emission of the nebula was not found. Taking all instrumental effects and the large nebular area into account, a conservative upper limit of 1 x 10 to the -12th erg/s per sq cm is derived. This is abou...

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Veröffentlicht in:	Astrophysics and space science 1987-07, Vol.135 (1), p.105-109
Hauptverfasser:	KÄHLER, H, ULE, T, WENDKER, H. J
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology Quasars. Active or peculiar galaxies, objects, and systems Stellar systems. Galactic and extragalactic objects and systems. The universe
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