Abstract
view Abstract Citations (28) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Isotopes of Magnesium in the Sun Branch, David Abstract Examination of the magnesium hydride 0-0 band in high-dispersion sunspot spectrograms reveals that, in addition to strong absorption lines of i4MgH, features due to 25MgH and 26MgH can be identified. The wavelengths of the isotopic lines are found to be in excellent agreement with predicted wavelengths. Coarse analysis indicates that in the sunspot region the isotopic ratios of mangesium, 24Mg: 28Mg: 28Mg, are nearer to 60:20:20 than to the terrestrial and meteoritic values of 79:10:11. Detailed analysis, based on several different sunspot models, also yields isotopic ratios of approximately 60:20:20. Because of uncertainties involving sunspot models, continuum location, line blending, and scattering photospheric light, the conclusion is limited to the statement that the heavy isotopes of magnesium appear to be enhanced in the Sun relative to the Earth. Further study based upon photoelectric spectrophotometry and improved sunspot models is suggested. Publication: The Astrophysical Journal Pub Date: January 1970 DOI: 10.1086/150288 Bibcode: 1970ApJ...159...39B full text sources ADS |
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