EXOSAT observations of the ring nebula NGC 6888 and HD 192163

Details EXOSAT observations of the ring nebula NGC 6888 and HD 192163 EXOSAT observations of the ring nebula NGC 6888 and HD 192163

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.135..105k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 135, no. 1, July 1987, p. 105-109.

Astronomy and Astrophysics

Astronomy

13

Exosat Satellite, Nebulae, Stellar Envelopes, Wolf-Rayet Stars, X Ray Astronomy, Charge Coupled Devices, Interstellar Matter, Stellar Winds, X Ray Imagery

Scientific paper

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 1×10-12erg s-1cm-2 (0.05 - 2 keV) is derived. This is about an order of magnitude less than predicted from braking the stellar wind of the central star HD 192163. Two point sources were serendipitously found in the field, HD 192163 and HD 192020.

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