Xe isotopic abundances in enstatite meteorites and relations to other planetary reservoirs

Meteorites formed in two reservoirs.

Enstatite Meteorites – Samples of the Inner Protoplanetary Disk?

Introduction: The two groups of enstatite chondrites (EH and EL) and aubrites, their differentiated counterparts, are a unique suite of specimens that formed under highly reducing conditions within the solar nebula, possibly on three separate parent bodies [1]. The reduced nature of the meteorites is shown by their unusual mineralogy, characterised by the presence of abundant sulphides. They al...

Pigeonholing Planetary Meteorites:

The last few years have provided two noteworthy examples of misclassifications of achondritic meteorites because the samples were new kinds of meteorites from planetary rather than asteroidal parent bodies. Basaltic lunar meteorite EET87521 was misclassified as a eucrite [1,2] and SNC (martian) orthopyroxenite ALH84001 was misclassified as a diogenite [3]. (Here a planetary body is one that rem...

Fluorine Abundances in Planetary Nebulae

We have determined fluorine abundances from the [F II] λ4789 and [F IV] λ4060 nebular emission lines for a sample of planetary nebulae (PNe). Our results show that fluorine is generally overabundant in PNe, thus providing new evidence for the synthesis of fluorine in asymptotic giant branch (AGB) stars. [F/O] is found to be positively correlated with the C/O abundance ratio, in agreement with t...

Isotopic Flow in Xe+Sn Collisions

The high accuracy that can be achieved in the experimental determination of flow parameters from data collected with advanced 4π detection systems has recently been demonstrated in a combined analysis of INDRA and FOPI data [1]. Excitation functions for directed and elliptic flow in Au + Au reactions, measured at SIS by the two collaborations [2, 3], were found to agree within 5% to at most 10%...