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The FERRUM Project: experimental and theoretical transition rates of forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels
H. Hartman, J. Gurell, P. Lundin +6
Context. In many plasmas, long-lived metastable atomic levels are depopulated by collisions (quenched) before they decay radiatively. In low-density regions, however, the low colli…
Origin of the early-type R stars: a binary-merger solution to a century-old problem?
Robert G. Izzard, C. Simon Jeffery, John Lattanzio
The early-R stars are carbon-rich K-type giants. They are enhanced in C12, C13 and N14, have approximately solar oxygen, magnesium isotopes, s-process and iron abundances, have the…
The near-infrared excitation of the HH211 protostellar outflow
Barry O'Connell, Michael D. Smith, Dirk Froebrich +2
The protostellar outflow HH211 is of considerable interest since it is extremely young and highly collimated. Here, we explore the outflow through imaging and spectroscopy in the n…
The Local Group Census: planetary nebulae in IC 10, Leo A and Sextans A
L. Magrini, R. L. M. Corradi, R. Greimel +8
In the framework of our narrow-band survey of the Local Group galaxies, we present the results of the search for planetary nebulae (PNe) in the dwarf irregular galaxies IC10, LeoA…
The shock waves in decaying supersonic turbulence
Michael D. Smith, Mordecai-Mark Mac Low, Julia M. Zuev
We here analyse numerical simulations of supersonic, hypersonic and magnetohydrodynamic turbulence that is free to decay. Our goals are to understand the dynamics of the decay and…