We report the discovery of extended X-ray emission from the planetary nebula BD +30 ° 3639. Analysis of the ROSAT HRI image shows clearly that BD +30 ° 3639 has extended X-ray emission which is well fitted with a Gaussian source of σ = 1 7-2 8 (95.4% confidence interval). This size is consistent with being the same as that of the optical nebula as imaged by the Hubble Space Telescope . BD +30 ° 3639 therefore represents the best case for the detection of a shocked-stellar-wind bubble in planetary nebulae.
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Leahy et al. (2000) studied this question.
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