Isotopic abundances of magnesium in Arcturus

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/154624· OSTI ID:7261827

Tomkin, J; Lambert, D L

High-resolution photoelectric scans of selected lines of the A/sup 2/Pi--X/sup 2/..sigma../sup +/ (0,0) band of MgH in the spectrum of Arcturus are compared with synthetic spectra to show that the /sup 24/Mg//sup 26/Mg isotope ratio in the atmosphere of Arcturus is 7.2(+3,--1.5), the same as the terrestrial ratio. There is evidence that the /sup 25/Mg isotope is deficient. We tentatively conclude that the /sup 24/Mg//sup 25/Mg ratio is about twice the terrestrial ratio of 7.9. (AIP)

• Research Organization: McDonald Observatory and Department of Astronomy, University of Texas, Austin
• OSTI ID: 7261827
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 208:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALINE EARTH METALS
ATMOSPHERES
CHEMICAL COMPOSITION
CHEMISTRY
COSMOCHEMISTRY
ELEMENTS
ENERGY-LEVEL TRANSITIONS
ISOTOPE RATIO
MAGNESIUM
METALS
SPECTRA
STARS
STELLAR ATMOSPHERES