The MgH B' ^2Σ^+-X ^2Σ^+ Transition: A New Tool for Studying Magnesium Isotope Abundances

Details The MgH B' ^2Σ^+-X ^2Σ^+ Transition: A New Tool for Studying Magnesium Isotope Abundances The MgH B' ^2Σ^+-X ^2Σ^+ Transition: A New Tool for Studying Magnesium Isotope Abundances

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524..454w&link_type=abstract

The Astrophysical Journal, Volume 524, Issue 1, pp. 454-461.

Astronomy and Astrophysics

Astronomy

23

Molecular Data, Sun: Abundances, Sun: Sunspots

Scientific paper

We have identified lines from the 0-3, 0-4, 0-5, 0-6, 0-7, 1-3, 1-4, 1-7, and 1-8 bands of the ^24MgH B' ^2Σ^+-X ^2Σ^+ transition in sunspot umbral spectra. Lines of the 0-7 and 1-8 bands in the uncluttered 7500 Å region are the most obvious, but B' ^2Σ^+-X ^2Σ^+ lines have been tracked as far to the blue as 5300 Å. In combination with weak lines of the 0-7 bands of the ^25MgH and ^26MgH isotopes, the solar isotope ratio ^24Mg:^25Mg:^26Mg has been measured as 76:12:12, in agreement with the much better determined terrestrial ratio 79:10:11. The intensity distribution of bands with v^'' from 4 to 8 has been measured and found to show no anomalies; the excitation temperature of 3100 K agrees well with a value of 3200 K determined from SiO in a sunspot spectrum. The lines of the MgH B' ^2Σ^+-X ^2Σ^+ transition are much more cleanly separated and much less blended than lines from the stronger A ^2Π-X ^2Σ^+ transition. The B' ^2Σ^+-X ^2Σ^+ lines should prove useful in isotopic abundance analyses for stars where the A^2Π-X ^2Σ^+ transition is too strong to yield useful results.

Affiliated with

Also associated with

No associations

Rating

The MgH B' ^2Σ^+-X ^2Σ^+ Transition: A New Tool for Studying Magnesium Isotope Abundances does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The MgH B' ^2Σ^+-X ^2Σ^+ Transition: A New Tool for Studying Magnesium Isotope Abundances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The MgH B' ^2Σ^+-X ^2Σ^+ Transition: A New Tool for Studying Magnesium Isotope Abundances will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1083884