An illumination effect and an eccentric orbit for the symbiotic binary PU Vul revealed by 32 years of optical spectroscopy
arXiv:1802.10565 · doi:10.1093/mnras/sty1686
Abstract
We analyze 32 years of optical spectra and photometry for the symbiotic binary PU Vul. Light curves for the He I 4471, He II 4686 and H 4861 emission lines reveal an illumination effect, where the hot white dwarf ionizes the outflowing wind of the red giant, and evidence for an eccentric orbit with e 0.16. Along with the gradual appearance of high ionization emission from [Fe VII] and O VI, the relative fluxes of these lines suggest an increase in the effective temperature of the hot component, from roughly K on JD 2448000 (1990) to roughly K on JD 2455000 (2009). During this period, the luminosity of the hot component dropped by a factor of 46 to a current value of roughly 1000 L.
arXiv commentAccepted for publication in MNRAS main journal
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