In large scale maps of the Galactic disc, Carina Arm stands out as a clear spiral feature, hosting prominent star clusters and associations rich in massive stars. We study proper motions 4199 O early B most likely far Arm, at distances mainly excess 4 kpc from Sun, within sky region, $282^{\circ} < \ell 294^{\circ}$ $-3^{\circ} b +1^{\circ}$ (Galactic coordinates). The sample is constructed by ...

The history of Russian-American relations is full various dramatic moments. There were periods strategic partnership and alliance, but also those aggravation diplomatic trade during the so-called Cold War. One thing persists from moment United States was formed in 18th century to early 21st century: Russia have been allies all military conflicts or maintained mutual neutrality. At same time, as...

Context. Thermonuclear supernovae (SNe), a subset of which are the highly important SNe Type Ia, remain one more poorly understood phenomena known to modern astrophysics. In recent years, single degenerate helium (He) donor channel, where white dwarf star accretes He-rich matter from hydrogen-depleted companion, has emerged as promising candidate progenitor scenario for these events. An unresol...

Today’s children are coming to the schoolhouse door significantly at risk for both educational and social failure. According to the Children’s Defense Fund (1990), “the mounting crisis of our children and families is a rebuke of everything America professes to be. It also will bring America to its economic knees and increase violence and discord within this country unless we confront it” (p. 3)...

Using ultraviolet photometry from the Ultraviolet Imaging Telescope (UIT ) combined with photometry and spectroscopy from three ground-based optical datasets we have analyzed the stellar content of OB associations and field areas in and around the regions N 79, N 81, N 83, and N 94 in the Large Magellanic Cloud. In particular, we compare data for the OB association Lucke-Hodge 2 (LH 2) to deter...

This paper presents a model for the outcome of collisions between planetesimals in a debris disk and assesses the impact of collisional processes on the structure and size distribution of the disk. The model is presented by its application to Fomalhaut’s collisionally replenished dust disk; a recent 450 μm image of this disk shows a clump embedded within it with a flux ∼ 5 per cent of the total...

This paper presents a model for the outcome of collisions between planetesimals in a debris disc, and assesses the impact of collisional processes on the structure and size distribution of the disc. The model is presented by its application to Fomalhaut’s collisionally replenished dust disc; a recent 450-μm image of this disc shows a clump embedded within it with a flux ∼5 per cent of the total...

The O(α,γ)Ne reaction is one of two known routes for breakout from the hot CNO cycles into the rp process. Its astrophysical rate depends on the decay properties of excited states in Ne lying just above the O + α threshold. We have measured the α-decay branching ratios for these states using the p(Ne,t)Ne reaction at 43 MeV/u. Combining our branching ratio measurements with previous determinati...