Stellar Evolution, Particle Transport, and the CP Phenomenon

Chemical element transport in stellar evolution models

Stellar evolution computations provide the foundation of several methods applied to study the evolutionary properties of stars and stellar populations, both Galactic and extragalactic. The accuracy of the results obtained with these techniques is linked to the accuracy of the stellar models, and in this context the correct treatment of the transport of chemical elements is crucial. Unfortunatel...

formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)

abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...

Stellar Structure and Evolution

Stellar evolution before the ZAMS

Young stars on their way to the ZAMS evolve in significantly different ways depending on their mass. While the theoretical and observational properties of lowand intermediate-mass stars are rather well understood and/or empirically tested, the situation for massive stars (> ∼ 10– 15 M⊙) is, to say the least, still elusive. On theoretical grounds, the PMS evolution of these objects should be ext...

FUors and Early Stellar Evolution

Ambartsumian was among the first researchers who recognized the importance and uniqueness of FUors, the term he coined for the rare outburst sources of the FU Orionis type. A wealth of observational data and concomitant theoretical work has advanced our understanding of FUors in the intervening almost 40 years. These results are summarized in this brief review, with special emphasis on observat...