Diffuse X-ray emission from the Dumbbell Nebula?

We have analyzed ROSAT Position Sensitive Proportional Counter pointed observations of the Dumbbell Nebula and find that the previously reported 'extended' X-ray emission is an instrumental electronic ghost image at the softest energy band. At slightly higher energy bands, the image of the...

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Bibliographic Details
Published in:The Astronomical journal 1993-08, Vol.106 (2), p.650-655
Main Authors: Chu, You-Hua, Kwitter, Karen B., Kaler, James B.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Earth, ocean, space
Exact sciences and technology
Interstellar medium (ism) and nebulae in milky way
Planetary nebulae
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary:We have analyzed ROSAT Position Sensitive Proportional Counter pointed observations of the Dumbbell Nebula and find that the previously reported 'extended' X-ray emission is an instrumental electronic ghost image at the softest energy band. At slightly higher energy bands, the image of the Dumbbell is not very different from that of the white dwarf HZ43. We conclude that the X-ray emission of the Dumbbell Nebula comes from its central star. A blackbody model is fitted to the spectrum and the best-fit temperature of not greater than 136,000 +/- 10,000 K is in excellent agreement with the Zanstra temperatures.
ISSN:0004-6256
1538-3881
DOI:10.1086/116671