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An occultation event in a triple post-AGB star
M. Hajduk, A. A. Zijlstra, K. Gesicki
We study the post-AGB central star of the (bipolar) Galactic bulge planetary nebula M 2-29. We have obtained additional HST imaging and SAAO spectroscopy of the object. The star sh…
Morphologies of the Nebulae around "born-again" Central Stars of Planetary Nebulae
S. Kimeswenger, A. A. Zijlstra, P. A. M. van Hoof +5
While in the past spherodicity was assumed, and still is used in modeling of most nebulae, we know now that only a small number of planetary nebulae (PNe) are really spherical or a…
Symmetry and Asymmetry in "born again" Planetary Nebulae
S. Kimeswenger, A. A. Zijlstra, P. A. M. van Hoof +4
While in the past spheroidicity was assumed, and still is used in modeling of most nebulae, we know now that only a small number of planetary nebulae (PNe) are really spherical or…
The enigma of the oldest `nova': the central star and nebula of CK Vul
M. Hajduk, Albert A. Zijlstra, P. A. M. van Hoof +9
CK Vul is classified as, amongst others, the slowest known nova, a hibernating nova, or a very late thermal pulse object. Following its eruption in AD 1670, the star remained visib…
The onset of photoionization in Sakurai's Object (V4334 Sgr)
P. A. M. van Hoof, M. Hajduk, Albert A. Zijlstra +6
We investigate the reheating of the very late thermal pulse (VLTP) object V4334 Sgr (Sakurai's Object) using radio observations from the Very Large Array, and optical spectra obtai…
The Real-Time Evolution of Sakurai's Star (V4334 Sgr) and other (V)LTP Objects
P. A. M. van Hoof, M. Bryce, A. Evans +10
We report on the progress of our on-going campaign to monitor the evolution of the VLTP objects V4334 Sgr and V605 Aql, as well as the suspected (V)LTP object CK Vul. V4334 Sgr doe…