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- W2017409100 abstract "We report an identification of the lithium resonance doublet Li i 6708 Å in the spectrum of V407 Cyg, a symbiotic Mira with a pulsation period of about 745 d. The resolution of the spectra used was R=λ/Δλ≈ 18 500 and the measured equivalent width of the line is ∼0.34 Å. It is suggested that the lithium enrichment is due to hot bottom burning in the intermediate-mass asymptotic giant branch (AGB) variable, although other possible origins cannot be totally ruled out. In contrast to lithium-rich AGB stars in the Magellanic Clouds, ZrO λλ5551, 6474 absorption bands were not found in the spectrum of V407 Cyg. These are the bands used to classify the S-type stars at low-resolution. Although we identified weak ZrO λλ5718, 6412 these are not visible in the low-resolution spectra, and we therefore classify the Mira in V407 Cyg as an M type. This, together with other published work, suggests lithium enrichment can precede the third dredge up of s-process enriched material in galactic AGB stars." @default.
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- W2017409100 date "2003-10-01" @default.
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- W2017409100 title "Lithium in the symbiotic Mira V407 Cyg" @default.
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- W2017409100 doi "https://doi.org/10.1046/j.1365-8711.2003.06911.x" @default.
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