12/15/2023 0 Comments Si element neutron![]() This work illustrates the importance of considering the neutron-capture elements when chemically characterizing stars and motivates ongoing work to improve their atomic data and measurements in spectroscopic surveys. Our results highlight that the neutron-capture elements contain information that is distinct from that of the lighter elements and thus add at least one dimension to Milky Way abundance space. While chemical similarity correlates with similarity in age and dynamics, including neutron-capture elements does not appear to select stars that are more similar in these characteristics. We measure the doppelganger rate in GALAH DR3, with abundances rederived using The Cannon, and find that considering the neutron-capture elements decreases the doppelganger rate from 2.2% to 0.4%, nearly a factor of 6, for stars with -0.1 < < 0.1. In this work, we probe the potential for neutron-capture elements to enhance the chemical diversity of stars by determining their effect on the chemical doppelganger rate. Silicon is a chemical element of the periodic table with chemical symbol Si and atomic number 14 with an atomic weight of 28. However, limited attention has been paid to the heavy elements (Z > 30) in this context. For zinc, the atomic weight is 65.39, so the mass number is closest to 65. For example, the APOGEE "chemical doppelganger rate," or the rate at which random pairs of field stars appear as chemically similar as stars born together, is high, and the chemical distributions of APOGEE stars in some Galactic populations are well-described by two-dimensional models. Number of Neutrons Mass Number - Number of Protons 1 - 1 0. Recent works have found that the chemical diversity of disk stars is low. 56 Fe has the maximum value for binding energy per nucleon. Elements with the largest binding energies in the iron mass region are produced abundantly. reactions, i.e., to radiative neutron capture. The reactions are shown schematically in Figure 3.5. ![]() Download a PDF of the paper titled Chemical Doppelgangers in GALAH DR3: the Distinguishing Power of Neutron-Capture Elements Among Milky Way Disk Stars, by Catherine Manea and 5 other authors Download PDF Abstract:The observed chemical diversity of Milky Way stars places important constraints on Galactic chemical evolution and the mixing processes that operate within the interstellar medium. In succession, there are stages of neon burning and then silicon burning (Box 3.5).
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