Li-6 in the atmosphere of GJ 117 revisited

Damian Christian, Michail Mathioudakis, D. Jevremovic

Research output: Contribution to journalArticle

Abstract

Detection of Li-6 has been shown for energetic solar events, one chromospherically active binary, and several dwarf halo stars. We had previously found a Li-6/Li-7 = 0.03 +/- 0.01 for active K dwarf GJ 117 using VLT UVES observations. Here we present high signal-to-noise (> 1000) high spectral resolution observations taken with the McDonald Observatory's 2.7 m and echelle spectrometer of GJ 117. We have used the solar spectrum and template stars to eliminate possible blends, such as Ti I, in the Li-6 spectral region. Our new analysis, using an updated PHOENIX model atmosphere, finds Li-6/Li-7 = 0.05 +/- 0.02. In addition, bisector analysis showed no significant red asymmetries that would affect the lithium line profile. No changes above the statistical uncertainties are found between the VLT and McDonald data. The amount of Li-6 derived for GJ 117 is consistent with creation in spallation reactions on the stellar surface, but we caution that uncertainties in the continuum level may cause additional uncertainty in the Li-6 fraction.
Original languageEnglish
Pages (from-to)542-547
Number of pages6
JournalAstrophysical Journal
Volume686
Publication statusPublished - 2008

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    Christian, D., Mathioudakis, M., & Jevremovic, D. (2008). Li-6 in the atmosphere of GJ 117 revisited. Astrophysical Journal, 686, 542-547.