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Nucleosynthesis Clocks and the Age of the Galaxy
J. W. Truran, S. Burles, J. J. Cowan +1
Nucleocosmochronology involves the use of the abundances of radioactive nuclear species and their radiogenic decay daughters to establish the finite age of the elements and the tim…
Galactic Cosmochronometry from Radioactive Elements in the Spectra of Very Old Metal-Poor Stars
C. Sneden, J. E. Lawler, J. J. Cowan
In a short review of neutron-capture elemental abundances in Galactic halo stars, emphasis is placed on the use of these elements to estimate the age of the Galactic halo. Two prom…
The Radio Recovery of SN 1970G: The Continuing Radio Evolution of SN 1970G
Christopher J. Stockdale, W. M. Goss, John J. Cowan +1
Using the Very Large Array, we have detected radio emission from the site of SN 1970G in the Sc galaxy M101. These observations are 31 years after the supernova event, making SN 19…
Tuning the Clock: Uranium and Thorium Chronometers Applied to CS 31082-001
R. Toenjes, H. Schatz, K. -L. Kratz +4
We obtain age estimates for the progenitor(s) of the extremely metal-poor ([Fe/H = -2.9) halo star CS 31082-001, based on the recently reported first observation of a Uranium abund…
The Fading Radio Emission from SN 1961V: Evidence for a Type II Peculiar Supernova?
Christopher J. Stockdale, Michael P. Rupen, John J. Cowan +2
Using the Very Large Array (VLA), we have detected radio emission from the site of SN 1961V in the Sc galaxy NGC 1058. With a peak flux density of 0.063 +/- 0.008 mJy/beam at 6 cm…
The Early Formation, Evolution and Age of the Neutron-Capture Elements in the Early Galaxy
J. J. Cowan, C. Sneden, J. W. Truran
Abundance observations indicate the presence of rapid-neutron capture (i.e., r-process) elements in old Galactic halo and globular cluster stars. These observations demonstrate tha…