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Discovery of Super-Li Rich Red Giants in Dwarf Spheroidal Galaxies | | Evan Kirby
; Xiaoting Fu
; Puragra Guhathakurta
; Licai Deng
; | | Date: |
4 May 2012 | | Abstract: | Stars destroy lithium (Li) in their normal evolution. The convective
envelopes of evolved red giants reach temperatures of millions of K, hot enough
for the 7Li(p,alpha)4He reaction to burn Li efficiently. Only about 1% of
first-ascent red giants more luminous than the luminosity function bump in the
red giant branch exhibit A(Li) > 1.5. Nonetheless, Li-rich red giants do exist.
We present 15 Li-rich red giants--14 of which are new discoveries--among a
sample of 2054 red giants in Milky Way dwarf satellite galaxies. Our sample
more than doubles the number of low-mass, metal-poor ([Fe/H] <~ -0.7) Li-rich
red giants, and it includes the most-metal poor Li-enhanced star known ([Fe/H]
= -2.82, A(Li)_NLTE = 3.15). Because most of these stars have Li abundances
larger than the universe’s primordial value, the Li in these stars must have
been created rather than saved from destruction. These Li-rich stars appear
like other stars in the same galaxies in every measurable regard other than Li
abundance. We consider the possibility that Li enrichment is a universal phase
of evolution that affects all stars, and it seems rare only because it is
brief. | | Source: | arXiv, 1205.1057 | | Services: | Forum | Review | PDF | Favorites | |
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