The 24MgH molecule in the atmospheres of late type stars - transition probabilities, oscillator strengths, and fine structures of rotation-vibration bands.
Abstract
Summary. Within the framework of the realistic Klein- Dunham potential, transition probabilities and oscillator strengths for the rotation-vibration bands of 24MgH are estimated from theoretically obtained coupled-electron- pair-approach dipole moments. Under the assumption of zero spin-orbit interaction, the higher N rotational structure of the rotation-vibration bands (A V =1,2 and 3) of the 24MgH molecule is obtained in the near infrared by a differencing technique using electronic bands measures of the A2it - X2 + system. A reversal of the R branch is observed (band-head formation) in each of the rotation-vibration bands. The rotational transitions: IA), 2-1 and 3-2 in the lowest four vibrational levels of the ground state 2 + are also predicted for the 24MgH. Johnson's extrapolated model atmosphere column density with the thin layer approximation gives a predicted equivalent width 9.8 for the 1-0 R band head of the 24MgH appropriate for the star 61 cyg B ( 0K, logg=45) spectrum. Key words: transition-pro babilities oscillator strengths molecular line identifications MgH late-type stars
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1977
- Bibcode:
- 1977A&A....54..417M
- Keywords:
-
- Late Stars;
- Magnesium Compounds;
- Metal Hydrides;
- Molecular Spectra;
- Stellar Atmospheres;
- Transition Probabilities;
- Abundance;
- Atmospheric Composition;
- Fine Structure;
- Molecular Oscillations;
- Molecular Rotation;
- Stellar Spectra;
- Astrophysics