The Magnesium Isotopologues of MgH in the A 2Π-X 2Σ+ System
Abstract
Using laboratory hollow cathode spectra we have identified lines of the less common magnesium isotopologues of MgH, 25MgH and 26MgH, in the A 2Π-X 2Σ+ system. Based on the previous analysis of 24MgH, molecular lines have been measured and molecular constants derived for 25MgH and 26MgH. Term values and linelists, in both wavenumber and wavelength units, are presented. The A 2Π-X 2Σ+ 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.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- August 2013
- DOI:
- 10.1088/0067-0049/207/2/26
- Bibcode:
- 2013ApJS..207...26H
- Keywords:
-
- molecular data;
- stars: abundances;
- stars: late-type;
- sunspots