• Europium, Samarium, And Neodymium Isotopic Fractions In Metal-Poor Stars 

      Roederer, I. U.; Lawler, J. E.; Sneden, C.; Cowan, J. J.; Sobeck, J. S.; Pilachowski, C. A. (2008-03)
      6We have derived isotopic fractions of europium (Eu), samarium (Sm), and neodymium (Nd) in two metal-poor giants with differing neutron-capture nucleosynthetic histories. These isotopic fractions were measured from new ...
    • Nucleosynthesis Predictions For Intermediate-Mass Asymptotic Giant Branch Stars: Comparison To Observations Of Type I Planetary Nebulae 

      Karakas, Amanda I.; van Raai, Mark A.; Lugaro, Maria; Sterling, N. C.; Dinerstein, Harriet L. (2009-01)
      Type I planetary nebulae (PNe) have high He/H and N/O ratios and are thought to be descendants of stars with initial masses of similar to 3-8 M(circle dot). These characteristics indicate that the progenitor stars experienced ...
    • Synthesis of the elements in stars: forty years of progress 

      Wallerstein, G.; Iben, I.; Parker, P.; Boesgaard, A. M.; Hale, G. M.; Champagne, A. E.; Barnes, C. A.; Kappeler, F.; Smith, V. V.; Hoffman, R. D.; Timmes, F. X.; Sneden, C.; Boyd, R. N.; Meyer, B. S.; Lambert, D. L. (1997-10)
      Forty years ago Burbidge, Burbidge, Fowler, and Hoyle combined what we would now call fragmentary evidence from nuclear physics, stellar evolution and the abundances of elements and isotopes in the solar system as well as ...
    • The Ubiquity Of The Rapid Neutron-Capture Process 

      Roederer, Ian U.; Cowan, John J.; Karakas, Amanda I.; Kratz, Karl-Ludwig; Lugaro, Maria; Simmerer, Jennifer; Farouqi, Khalil; Sneden, Christopher (2010-12)
      To better characterize the abundance patterns produced by the r-process, we have derived new abundances or upper limits for the heavy elements zinc (Zn, Z = 30), yttrium (Y, Z = 39), lanthanum (La, Z = 57), europium (Eu, ...