A LABORATORY log(gf) MEASUREMENT OF THE Ti ii 15873.84 Å H-BAND LINE IN SUPPORT OF SDSS-III APOGEE

@article{Wood2014ALL,
  title={A LABORATORY log(gf) MEASUREMENT OF THE Ti ii 15873.84 {\AA} H-BAND LINE IN SUPPORT OF SDSS-III APOGEE},
  author={Michael P. Wood and James E. Lawler and Matthew D. Shetrone},
  journal={The Astrophysical Journal Letters},
  year={2014},
  volume={787}
}
The SDSS-III APOGEE collaboration has identified a single useable line in the H-band spectra of APOGEE target stars arising from a singly ionized species. This line of Ti ii (λair = 15873.84 Å) is therefore of great importance for use in stellar surface gravity, or log(g), determinations via the Saha equation. While a theoretical estimate of the line strength exists, to date no laboratory measurement of the line strength has been reported. Herein we report an absolute laboratory transition… 

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