Angular dimensions of planetary nebulae

  title={Angular dimensions of planetary nebulae},
  author={Romuald Tylenda and Natasza Si{\'o}dmiak and Sławomir K. G{\'o}rny and Romano L. M. Corradi and Hugo E. Schwarz},
  journal={Astronomy and Astrophysics},
We have measured angular dimensions of 312 planetary nebulae from their images obtained in H α (or H α  + [NII]). We have applied three methods of measurements: direct measurements at the 10% level of the peak surface brightness, Gaussian deconvolution and second-moment deconvolution. The results from the three methods are compared and analysed. We propose a simple deconvolution of the 10% level measurements which significantly improves the reliability of these measurements for compact and… 

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