The planetary nebula K 1-2 and its binary central star VW Pyx
Exter, K.M.; Pollacco, D.L.; Bell, S.A. (2003). The planetary nebula K 1-2 and its binary central star VW Pyx. Monthly Notices of the Royal Astronomical Society 341(4): 1349-1359. https://dx.doi.org/10.1046/j.1365-8711.2003.06505.x
In: Monthly Notices of the Royal Astronomical Society. OXFORD UNIV PRESS: Oxford. ISSN 0035-8711; e-ISSN 1365-2966, more
New data are presented of the post-common-envelope binary VW Pyx and its associated planetary nebula (PN), K 1-2. The central star is found to be a single-lined (and possibly double-lined) spectroscopic binary and is a good candidate for a system in which the main-sequence secondary star is more massive than the subdwarf primary star. The old PN has a high excitation level and a measured electron temperature, TO∼ 17 000 K for an assumed log ne= 2.7 cm−3. The so-called ‘jets’ are found to be lower-ionization regions with TN∼ 11 000 K and TO∼ 16 000 K with log ne∼ 2.5 cm−3 and with low, but fairly typical, PN abundances. We discuss possible histories for K 1-2 and the jets. However, there are still many unknowns in the study of accretion and jet formation for such PN binary central stars.
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