Browsing by Author "Acker, A."

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    • A barium central star binary in the Type-I diamond ring planetary nebula Abell 70 

      Miszalski, B.; M. J. Boffin, H.; Frew, David J.; Acker, A.; Köppen, J.; F. J. Moffat, A.; A. Parker, Q. (2012-01)
      Abell 70 (PN G038.1-25.4, hereafter A 70) is a planetary nebula (PN) known for its diamond ring appearance due a superposition with a background galaxy. The previously unstudied central star is found to be a binary consisting ...

    • The influence of binarity on dust obscuration events in the planetary nebula M 2-29 and its analogues 

      Miszalski, B.; Mikolajewska, J.; Koppen, K.; Rauch, T.; Acker, A.; Cohen, M.; Frew, D.J.; Moffat, A.F.J.; Parker, Q.A.; Jones, A.F.; Udalski, A. (2011)
      The central star of the planetary nebula (CSPN) M 2-29 shows an extraordinary R Coronae Borealis-like fading event in its optical lightcurve. The only other CSPN to show these events are CPD−56◦8032 (Hen 3-1333) and V651 ...

    • Newly discovered Wolf-Rayet and weak emission-line central stars of planetary nebulae 

      DePew, K.; Parker, Q. A.; Miszalski, B.; De Marco, O.; Frew, D. J.; Acker, A.; Kovacevic, A. V.; Sharp, R. G. (2011-07)
      We present the spectra of 32 previously unpublished confirmed and candidate Wolf-Rayet ([WR]) and weak emission-line (WELS) central stars of planetary nebulae (CSPNe). 18 stars have been discovered in the Macquarie/AAO/Strasbourg ...