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Chlorine Abundances in Cool Stars | | Z. G. Maas
; C. A. Pilachowski
; K. Hinkle
; | | Date: |
6 Sep 2016 | | Abstract: | Chlorine abundances are reported in 15 evolved giants and one M dwarf in the
solar neighborhood. The Cl abundance was measured using the vibration-rotation
1-0 P8 line of H$^{35}$Cl at 3.69851 $mu$m. The high resolution L-band spectra
were observed using the Phoenix infrared spectrometer on the Kitt Peak Mayall
4m telescope. The average [$^{35}$Cl/Fe] abundance in stars with
--0.72$<$[Fe/H]$<$0.20 is [$^{35}$Cl/Fe]=(--0.10$pm$0.15) dex. The mean
difference between the [$^{35}$Cl/Fe] ratios measured in our stars and chemical
evolution model values is (0.16$pm$0.15) dex. The [$^{35}$Cl/Ca] ratio has an
offset of $sim$0.35 dex above model predictions suggesting chemical evolution
models are under producing Cl at the high metallicity range. Abundances of C,
N, O, Si, and Ca were also measured in our spectral region and are consistent
with F and G dwarfs. The Cl versus O abundances from our sample match Cl
abundances measured in planetary nebula and ion{H}{2} regions. In one star
where both H$^{35}$Cl and H$^{37}$Cl could be measured, a $^{35}$Cl/$^{37}$Cl
isotope ratio of 2.2$pm$0.4 was found, consistent with values found in the
Galactic ISM and predicted chemical evolution models. | | Source: | arXiv, 1609.1626 | | Services: | Forum | Review | PDF | Favorites | |
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