The Magnesium Isotopologues of MgH in the A(2)Pi-X-2 Sigma(+) System

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Hinkle, Kenneth H.
Wallace, Lloyd
Ram, Ram S.
Bernath, Peter F.
Sneden, Christopher
Lucatello, Sara

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Using laboratory hollow cathode spectra we have identified lines of the less common magnesium isotopologues of MgH, (MgH)-Mg-25 and (MgH)-Mg-26, in the A(2)Pi-X-2 Sigma(+) system. Based on the previous analysis of (MgH)-Mg-24, molecular lines have been measured and molecular constants derived for (MgH)-Mg-25 and (MgH)-Mg-26. Term values and linelists, in both wavenumber and wavelength units, are presented. The A(2)Pi-X-2 Sigma(+) system of MgH is important for measuring the magnesium isotope ratios in stars. Examples of analysis using the new linelists to derive the Mg isotope ratio in a metal poor dwarf and giant are shown.



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Hinkle, Kenneth H., Lloyd Wallace, Ram S. Ram, Peter F. Bernath, Christopher Sneden, and Sara Lucatello. "The Magnesium Isotopologues of MgH in the A 2?-X 2?+ System." The Astrophysical Journal Supplement Series, Vol. 207, No. 2 (Aug., 2013): 26.