MG Isotope Ratios in the Globular Cluster M13

Details MG Isotope Ratios in the Globular Cluster M13 MG Isotope Ratios in the Globular Cluster M13

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18710313s&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #103.13; Bulletin of the American Astronomical Society, Vol. 27, p.1432

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Scientific paper

Seven M13 red giants (Shetrone 1995) are reobserved at high resolution (R=61000) with S/N ranging between 106 to 166 per resolution element at 5135 Angstroms. Isotopic analysis of the 5135 Angstroms MgH bands reveal five stars with super solar ratios of (25) Mg + (26) Mg compared with (24) Mg and one star with solar isotopic ratios. Only one star, L598, has sub-solar isotope ratios consistent with those found in other population II stars. The isotope ratios ((25) Mg + (26) Mg)/(24) Mg anti-correlate with the Al abundances and correlate with the total Mg ((24) Mg + (25) Mg + (26) Mg) abundances. The star to star [Mg/Fe] variations are mostly due to (24) Mg, which is inconsistent with the deep mixing scenario of Langer and Hoffman 1996, unless the nuclear cross-sections for proton capture on (24) Mg are larger than currently reported.

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