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Title: THE MAGNESIUM ISOTOPOLOGUES OF MgH IN THE A {sup 2}{Pi}-X {sup 2}{Sigma}{sup +} SYSTEM

Using laboratory hollow cathode spectra we have identified lines of the less common magnesium isotopologues of MgH, {sup 25}MgH and {sup 26}MgH, in the A {sup 2}{Pi}-X {sup 2}{Sigma}{sup +} system. Based on the previous analysis of {sup 24}MgH, molecular lines have been measured and molecular constants derived for {sup 25}MgH and {sup 26}MgH. Term values and linelists, in both wavenumber and wavelength units, are presented. The A {sup 2}{Pi}-X {sup 2}{Sigma}{sup +} 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.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726 (United States)
  2. Department of Chemistry, University of York, Heslington, York YO10 5DD (United Kingdom)
  3. Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)
  4. INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy)
Publication Date:
OSTI Identifier:
22140289
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 207; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; GALAXIES; HOLLOW CATHODES; HYDROGEN COMPOUNDS; MAGNESIUM 25; MAGNESIUM 26; MAGNESIUM COMPOUNDS; MAGNESIUM HYDRIDES; SPECTRA; STARS; SUNSPOTS