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Constraining the Optical Emission from the Double Pulsar System J0737-3039

Publication Date
  • Binaries: General
  • Stars: Imaging
  • Pulsars: Individual: Psr J0737-3039A Psr J0737-3039B
  • Techniques: Photometric
  • Astronomy


CONSTRAINTS ON NUCLEOSYNTHESIS FROM XENON ISOTOPES IN PRESOLAR MATERIAL J. D. Gilmour and G. Turner School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK; [email protected] Received 2006 July 12; accepted 2006 November 7 ABSTRACT By applying theoretical constraints to three-dimensional fits of xenon isotope data from presolar grains, we show that they strongly suggest a nucleosynthesis process that produces ‘‘r-process’’ isotopes without producing s-process isotopes (128Xe, 130Xe) and without producing the conventional r-process isotope 136Xe. It is one of three distinct nucleosynthetic sources that are necessary and sufficient to explain the gross variation in xenon isotopic data across all presolar material. The other source contributing r-process isotopes is responsible for the heavy isotope signature identified in nanodiamonds, which is also present in presolar SiC, and is associated with light isotope enrichment. The relative enrichments of heavy and light isotopes in this component in nanodiamonds and SiC grains are dif- ferent, implying that the parent nucleosynthetic processes are not inextricably linked. Because minor variations in the isotopic compositions of xenon trapped in nanodiamonds show that two distinct sites contributed nanodiamonds to the early solar system within the average grain lifetime, it is suggested that Type IIa supernovae (SNe IIa) are not the source of the nanodiamonds. The s-process signature derived is consistent with that derived frommixing lines between grain subpopulations for isotopes on the s-process path. This implies that a pure end-member is present in the grains (although not approached in analyses). Our approach is more general and provides a less restrictive set of numerical constraints to be satisfied by proposed theoretical treatments of nucleosynthesis. Subject headinggs: Galaxy: evolution — methods: data analysis — nuclear reactions, nucleosynthesis, abundances — solar system: forma

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