SIMBAD references

2009PASP..121..117W - Publ. Astron. Soc. Pac., 121, 117-124 (2009/February-0)

Calibrating M-dwarf metallicities using molecular indices: extension to low-metallicity stars.


Abstract (from CDS):

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 for stars with [Fe/H] between and and temperatures between 3500 and 4000 K. We also report a method to estimate temperatures for M dwarfs using equivalent width measurements of the infrared Ca II triplet and the K I line at 7699 Å. 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.

Abstract Copyright:

Journal keyword(s): Stars

VizieR on-line data: <Available at CDS (J/PASP/121/117): table1.dat table3.dat>

Simbad objects: 12

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