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J/PASP/121/117 Fe and Ti abundances of 12 low-metallicity M stars (Woolf+, 2009)
The following files can be converted to FITS (extension .fit or fit.gz)
table1.dat table3.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/PASP/121/117
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Beginning of ReadMe :J/PASP/121/117 Fe and Ti abundances of 12 low-metallicity M stars (Woolf+, 2009)
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Calibrating M-dwarf metallicities using molecular indices: extension to
low-metallicity stars.
Woolf V.M., Lepine S., Wallerstein G.
<Publ. Astron. Soc. Pac., 121, 117-124 (2009)>
=2009PASP..121..117W
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ADC_Keywords: Stars, dwarfs ; Stars, M-type ; Abundances
Abstract:
We have calculated Fe and Ti abundances in 12 low-metallicity main
sequence M stars using high-resolution spectra. These subdwarf and
extreme-subdwarf stars allow us to extend our calibration of a method
to determine cool-dwarf-star metallicities using molecular band
strength indices from low-resolution spectra. Our calibration can now
be used to determine metallicity to within +/-0.3dex for stars with
[Fe/H] between -1.5 and +0.05 and temperatures between 3500 and 4000K.
We also report a method to estimate temperatures for M dwarfs using
equivalent width measurements of the infrared CaII triplet and the
KI line at 7699AA. Our metallicity measurements show that the recently
proposed classification system for low-mass stars (dwarfs, subdwarfs,
extreme subdwarfs, and ultrasubdwarfs) does represent a metallicity
sequence, with the ultrasubdwarfs the most metal-poor stars.
Description:
We obtained spectra of 12 subdwarf and extreme-subdwarf M stars using
queue scheduled observing of the Hobby-Eberly Telescope. The spectra
were measured using the high-resolution spectrograph set to give
spectral resolution lambda/Deltalambda 30,000.