Lithium in the Symbiotic Mira V407 Cyg

Details Lithium in the Symbiotic Mira V407 Cyg Lithium in the Symbiotic Mira V407 Cyg

2003-06-14

arxiv.org/abs/astro-ph/0306295v1

Mon.Not.Roy.Astron.Soc. 344 (2003) 1233

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to be published in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06911.x

We report an identification of the lithium resonance doublet LiI 6708A in the spectrum of V407 Cyg, a symbiotic Mira with a pulsation period of about 745 days. The resolution of the spectra used was R~18500 and the measured equivalent width of the line is ~0.34A. It is suggested that the lithium enrichment is due to hot bottom burning in the intermediate mass AGB variable, although other possible origins cannot be totally ruled out. In contrast to lithium-rich AGB stars in the Magellanic clouds, ZrO 5551A, 6474A absorption bands were not found in the spectrum of V407Cyg. These are the bands used to classify the S-type stars at low-resolution. Although we identified weak ZrO 5718A, 6412A 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.

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