WR 72: a born-again planetary nebula with hydrogen-poor knots

@inproceedings{Gvaramadze2020WR7A,
  title={WR 72: a born-again planetary nebula with hydrogen-poor knots},
  author={Vasilii V. Gvaramadze and Alexei Yu. Kniazev and G{\"o}tz Gr{\"a}fener and Norbert Langer},
  year={2020}
}
We report the discovery of a handful of optical hydrogen-poor knots in the central part of an extended infrared nebula centred on the [WO1] star WR 72, obtained by spectroscopic and imaging observations with the Southern African Large Telescope (SALT). Wide-field Infrared Survey Explorer (WISE) images of the nebula show that it is composed of an extended almost circular halo (of $\approx6$ arcmin or $\approx2.4$ pc in diameter) and an elongated and apparently bipolar inner shell (of a factor of… CONTINUE READING

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