ar X iv : 0 90 6 . 16 23 v 1 [ as tr o - ph . S R ] 9 J un 2 00 9 montage : AGB nucleosynthesis with full s - process calculations

ar X iv : 0 90 2 . 15 36 v 1 [ as tr o - ph . S R ] 9 F eb 2 00 9 A Review of AGB Mass Loss Imaging Techniques

Circumstellar imaging, across the electromagnetic spectrum, allows to derive fundamental diagnostics for the physics of mass loss in the AGB phase. I review the current status of the field, with particular emphasis on the techniques that provide the strongest constraints for mass loss modeling efforts.

ar X iv : 0 90 4 . 41 63 v 1 [ as tr o - ph . S R ] 2 7 A pr 2 00 9 The 13 C Pocket In Low Mass AGB Stars

It is well known that thermally pulsing Asymptotic Giant Branch stars with low mass play a relevant role in the chemical evolution. They have synthesized about 30% of the galactic carbon and provide an important contribution to the nucleosynthesis of heavy elements (A>80). The relevant nucleosynthesis site is the He-rich intermediate zone (less than 10 M⊙), where α(2α, γ) C reactions and slow n...

ar X iv : 0 90 5 . 43 65 v 1 [ as tr o - ph . S R ] 2 7 M ay 2 00 9 Nucleosynthesis of light element isotopes in evolved stars experiencing extended mixing

We present computations of nucleosynthesis in red giants and asymptotic giant branch stars of Population I experiencing extended mixing. The assumed physical cause for mass transport is the buoyancy of magnetized structures, according to recent suggestions. The peculiar property of such a mechanism is to allow for both fast and slow mixing phenomena, as required for reproducing the spread in Li...

ar X iv : 0 90 6 . 16 30 v 1 [ m at h . SP ] 9 J un 2 00 9 FINITE GAP JACOBI MATRICES , II . THE SZEGŐ CLASS

Let e ⊂ R be a finite union of disjoint closed intervals. We study measures whose essential support is e and whose discrete eigenvalues obey a 1/2-power condition. We show that a Szeg˝ o condition is equivalent to lim sup a 1 · · · a n cap(e) n > 0 (this includes prior results of Widom and Peherstorfer–Yuditskii). Using Remling's extension of the Denisov–Rakhmanov theorem and an analysis of Jos...

ar X iv : 0 90 3 . 05 62 v 1 [ as tr o - ph . G A ] 3 M ar 2 00 9 Introduction to Millimeter / Sub - Millimeter