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Production and evolution of light elements in active star-forming regions.

机译：活跃恒星形成区域中轻元素的产生和演化。

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Collisions between cosmic rays (energetic protons and alpha-particles) and carbon, nitrogen and oxygen in the interstellar medium have been considered to be the main source of lithium, beryllium and boron, through fragmentation of the larger nuclei. But this mechanism is unable to account for the observed Solar System abundances of the isotopes 7Li and 11B. The recent detection of an excess of gamma-rays in the direction of the star-forming region in the Orion cloud has been interpreted as arising from the excitation of carbon and oxygen nuclei ejected from supernovae when they collide with the surrounding gas, which is primarily molecular and atomic hydrogen. Here we investigate the consequences of the two-body interactions of the ejected carbon and oxygen nuclei (and the alpha-particles ejected with them) with the hydrogen and helium in the surrounding gas, using a model developed previously. We show that these interactions offer a way to make lithium, beryllium and boron that is independent of the abundance of heavy elements in the surrounding medium. Such supernova-driven interactions, combined with the effect of galactic cosmic rays, can explain the observed Solar System abundances of these light elements.
机译：星际介质中的宇宙射线（高能质子和α粒子）与碳，氮和氧之间的碰撞，被认为是通过较大核碎裂而产生的锂，铍和硼的主要来源。但是这种机制无法解释同位素7Li和11B观测到的太阳系丰度。最近在猎户座云中检测到在形成恒星的方向上存在过多的伽马射线，这被解释为是由于超新星喷出的碳核和氧核与周围的气体碰撞而受到激发而引起的分子氢和原子氢。在这里，我们使用先前开发的模型，研究了喷射的碳和氧核（以及与之一起喷射的α粒子）与周围气体中的氢和氦的两体相互作用的后果。我们表明，这些相互作用提供了一种制造锂，铍和硼的方法，该方法与周围介质中大量重元素无关。这种超新星驱动的相互作用，加上银河系宇宙射线的影响，可以解释所观测到的这些光元素的太阳系丰度。

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