An illumination effect and an eccentric orbit for the symbiotic binary PU Vul revealed by 32 yr of optical spectroscopy

作者：Cuneo Virginia A^*; Kenyon Scott J; Gomez Mercedes N; Chochol Drahomir; Shugarov Sergey Y; Kolotilov Eugeni A

来源：Monthly Notices of the Royal Astronomical Society, 2018, 479(2): 2728-2742.

DOI：10.1093/mnras/sty1686

• binaries: spectroscopic
• binaries: symbiotic
• stars: individual: PU Vul

We analyse similar to 32 yr of optical spectra and photometry for the symbiotic binary PU Vul. Light curves for the He I lambda 4471, He II lambda 4686, and H beta lambda 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 OVI, the relative fluxes of these lines suggest an increase in the effective temperature of the hot component, from roughly 10(5) K on JD 244 8000 (1990) to roughly 2 x 10(5) K on JD 245 5000 (2009). During this period, the luminosity of the hot component dropped by a factor of 4-6 to a current value of roughly 1000 L-circle dot.

• 出版日期2018-9
• 单位东南大学