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- W2892374359 abstract "High and low resolution $IUE$ spectra of V838 Her in the early outburst stages exhibit a strong absorption feature shortward of $lambda$3130. We discuss the nature of this spectral feature and provide convincing evidence that it corresponds to the blue-shifted resonance doublet of singly-ionized $^7$Be, recently discovered in other novae. During the evolution of the outburst the appearance of an emission feature close to $lambda$3130 is also identified as $^7$Be II $lambda$3132 because the usual identification as the O III $lambda$3133.7 Bowen fluorescence line is hardly compatible with both the known oxygen under-abundance in the nova ejecta and the low optical depths in the nebula due to the high outflow velocity. The average $^7$Be abundance relative to hydrogen, estimated by four different methods, i.e. the $^7$Be II / Mg II absorption ratio, and the $^7$Be II / Mg II, $^7$Be II / He II$_{1640}$, and $^7$Be II / H$beta$ emission ratios is N(Be)/N(H) $approx$ 2.5 $times 10^{-5}$ (by number), i.e. $approx$ 1.7 $times 10^{-4}$ by mass. This corresponds to an overproduction of $^7$Be by about 1 dex in comparison with the theoretical models of massive CO and ONe novae. Since $^7$Be all converts into $^7$Li, the $^7$Be/H abundance implies a $^7$Li/H overabundance of about 4 dex over the $^7$/H meteoritic value and indicates a total ejected mass of $^7$Li of $approx$ 9.5$times$10$^{-10}$ $M_{odot}$. These data are in line with previous observations and indicate that large amounts of $^7$Li can be synthesized in a variety of novae, including very fast ONe novae." @default.
- W2892374359 created "2018-09-27" @default.
- W2892374359 creator A5031906583 @default.
- W2892374359 creator A5059722374 @default.
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- W2892374359 date "2018-08-23" @default.
- W2892374359 modified "2023-09-28" @default.
- W2892374359 title "Absorption and emission features of 7Be ii in the outburst spectra of V838 Her (Nova Her 1991)" @default.
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- W2892374359 doi "https://doi.org/10.1093/mnras/sty2310" @default.
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