Identification of SH Δv=1 Ro-vibrational Lines in R Andromedae

  title={Identification of SH $\Delta$v=1 Ro-vibrational Lines in R Andromedae},
  author={Issei Yamamura and Kenji Kawaguchi and Stephen T. Ridgway},
  journal={The Astrophysical Journal Letters},
  pages={L33 - L36}
We report the identification of SH Δv = 1 ro-vibrational lines in the published high-resolution infrared spectrum of the S-type star R Andromedae. This is the first astronomical detection of this molecule. The lines show inverse P Cygni profiles, indicating infall motion of the molecular layer due to stellar pulsation. A simple spherical shell model with a constant infall velocity is adopted to determine the condition of the layer. It is found that a single excitation temperature of 2200 K… 

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