Browsing by Author "Akras, S."
Now showing items 1-4 of 4
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A morpho-kinematic and spectroscopic study of the bipolar nebulae: m 2−9, mz 3, and hen 2−104
Clyne, N.; Akras, S.; Steffen, W.; Redman, M. P.; Gonçalves, D. R.; Harvey, E. (EDP Sciences, 2015-10-01)Context. Complex bipolar shapes can be generated either as a planetary nebula or a symbiotic system. The origin of the material ionised by the white dwarf is very different in these two scenarios, and it complicates the ... -
Deciphering the bipolar planetary nebula abell 14 with 3d ionization and morphological studies
Akras, S.; Clyne, N.; Boumis, P.; Monteiro, H.; Gonçalves, D. R.; Redman, M. P.; Williams, S. (Oxford University Press (OUP), 2016-02-23)Abell 14 is a poorly studied object despite being considered a born-again planetary nebula. We performed a detailed study of its 3D morphology and ionization structure using the SHAPE and MOCASSIN codes. We found that Abell ... -
Modelling the structure and kinematics of the firework nebula: the nature of the gk persei nova shell and its jet-like feature
Harvey, E.; Redman, M. P.; Boumis, P.; Akras, S. (EDP Sciences, 2016-10-28)Aims. The shaping mechanisms of old nova remnants are probes for several important and unexplained processes, such as dust formation and the structure of evolved star nebulae. To gain a more complete understanding of the ... -
Observations and analysis of the gk persei nova shell and its “jet-like” feature
Harvey, E.; Redman, M.P.; Boumis, P.; Akras, S. (EDP Sciences, 2015-01-01)GK Persei (1901, the "Firework Nebula") is an old but bright nova remnant that offers a chance to probe the physics and kinematics of nova shells. The kinematics in new and archival longslit optical echelle ...