M-subdwarfs: spectroscopic classification and the metallicity scale

@article{Gizis1997MsubdwarfsSC,
  title={M-subdwarfs: spectroscopic classification and the metallicity scale},
  author={J. Gizis},
  journal={The Astronomical Journal},
  year={1997},
  volume={113},
  pages={806-822}
}
  • J. Gizis
  • Published 1997
  • Physics
  • The Astronomical Journal
We present a spectroscopic classification system for M-dwarfs and M-subdwarfs based on quantitative measures of TiO and CaH features in the region 6200 - 7400 Angstroms. Our sample of cool stars covers the range from solar metallicity stars to the most extreme subdwarfs known. Using synthetic spectra computed by Allard and Hauschildt (1995), we derive metallicities for the stars. Stars are classified as dwarfs (M V), subdwarfs (sdM), or extreme subdwarfs (esdM). These classifications correspond… Expand
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