Calcium triplet

The infrared Ca II triplet, commonly known as the calcium triplet, is a triplet of three ionised calcium spectral lines at the wavelengths of 8498 Å, 8542 Å and 8662 Å. The triplet has a strong emission,[1] and is most prominently observed in the absorption of spectral type G, K and M stars.[2][3]

See also

References
  1. Polidan, R. S. (1976). "On the Detection of Binary be Stars" (PDF). Be and Shell Stars: IAU Symposium no. 70. p. 405.
  2. Andretta; Busà; Gomez; Terranegra (2005). "The Ca II Infrared Triplet as a stellar activity diagnostic" (PDF). Astronomy & Astrophysics. p. 669.
  3. Jonathan Tennyson (2005). "Astronomical Spectroscopy. An introduction to the atomic and molecular physics in astronomical spectra" (PDF). Imperial College Press. p. 94. Archived from the original (PDF) on 2016-01-16. Retrieved 2016-07-09.


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