Fe and Ti abundances of 12 low-metallicity M stars

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 7699{AA}. 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.

Cone search capability for table J/PASP/121/117/table1 (M and K dwarf magnitudes and parallaxes)

Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/PASP/121/117
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/121/117
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/121/117
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/PASP/121/117
Creator Woolf V.M.; Lepine S.; Wallerstein G.
Publisher CDS
Publication Year 2009
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Interdisciplinary Astronomy; Natural Sciences; Physics; Stellar Astronomy