EUROPIUM s-PROCESS SIGNATURE AT CLOSE-TO-SOLAR METALLICITY IN STARDUST SiC GRAINS FROM AGB STARS

نویسندگان

  • JANAÍNA N. ÁVILA
  • TREVOR R. IRELAND
  • MARIA LUGARO
  • FRANK GYNGARD
  • ERNST ZINNER
  • SERGIO CRISTALLO
  • PETER HOLDEN
  • THOMAS RAUSCHER
چکیده

1 Research School of Earth Sciences, The Australian National University, Canberra ACT 0200, Australia; [email protected] 2 Planetary Science Institute, The Australian National University, Canberra ACT 0200, Australia 3 Astronomy Department/IAG, University of São Paulo, São Paulo SP 05508-090, Brazil 4 Monash Centre for Astrophysics, Monash University, Clayton VIC 3800, Australia 5 Laboratory for Space Sciences and the Department of Physics, Washington University, One Brookings Drive, St. Louis, MO 63130, USA 6 Osservatorio Astronomico di Collurania, INAF, Teramo 64100, Italy 7 Centre for Astrophysics Research, School of Physics, Astronomy, and Mathematics, University of Hertfordshire, Hatfield AL10 9AB, United Kingdom 8 Department of Physics, University of Basel, 4056 Basel, Switzerland

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

On the Mass and Metallicity Distributions of the Parent AGB Stars of O-rich Presolar Stardust Grains

Presolar grains in meteorites formed in a sample of AGB stars that ended their lives within ≈1 Gyr of the origin of the Solar System 4.6 Gyr ago. The O-isotopic compositions of presolar O-rich stardust reflect the masses and metallicities of their parent stars. We present simple Monte Carlo simulations of the parent AGB stars of presolar grains. Comparison of model predictions with the grain da...

متن کامل

Probing the Galactic Chemical Evolution of Si and Ti with Presolar Sic Grains

Presolar SiC grains of the types mainstream, Y, and Z are believed to have formed in thermally pulsing asymptotic giant branch stars with a range of metallicity: mainstream grains in stars of close-to-solar metallicity, Y grains in stars of around half-solar metallicty, and Z grains in stars of around one-third solar metallicity. From their Si and Ti isotopic ratios, it is possible to obtain in...

متن کامل

A New Astrophysical Interpretation of the Si and Ti Isotopic Compositions of Mainstream SiC Grains from Primitive Meteorites

Mainstream presolar SiC grains from primitive meteorites show a clear sprocess signature in the isotopic composition of heavy trace elements. These grains most likely condensed in the winds of a variety of AGB stars. However, the non-solar and correlated Si and Ti isotopic compositions measured in these grains are inconsistent with a pure s-signature. We present a possible solution to this much...

متن کامل

Extinct technetium in silicon carbide stardust grains: implications for stellar nucleosynthesis.

The isotopic composition of ruthenium (Ru) in individual presolar silicon carbide (SiC) stardust grains bears the signature of s-process nucleosynthesis in asymptotic giant branch stars, plus an anomaly in 99Ru that is explained by the in situ decay of technetium isotope 99Tc in the grains. This finding, coupled with the observation of Tc spectral lines in certain stars, shows that the majority...

متن کامل

IRON AND NICKEL ISOTOPIC RATIOS IN PRESOLAR SiC GRAINS

We report the first Fe isotopic anomalies and the first Ni isotopic ratio measurements in presolar SiC grains of separate KJG from the Murchison meteorite. With NanoSIMS, we analyzed Fe and Ni in 37 X grains from Type II supernovae and 53 SiC grains of other types. TheNi/Fe and Co/Fe ratios in grains of all types aremuch higher than in the gas from which the grains are believed to have condense...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2013