西媒：科学家观测到红巨星演化细节 太阳未来也将进类似阶段

       西媒称，20日发表在《自然》杂志上的研究报告显示，欧洲南方天文台的一个科学家团队观测到了一颗红巨星表面变化过程的“史无前例的细节”。

　　据埃菲社12月20日报道，红巨星是“中老年”阶段的恒星，其体积会膨胀到非常巨大的程度，外层气体密度变低，表面温度下降，看起来呈红色，红巨星是恒星燃烧到后期所经历的一个不稳定阶段。

　　报道称，这颗红巨星名为“天鹤座π”(Pi Gruis)，质量与太阳差不多，但直径比太阳大350倍。

　　该团队的科学家称，太阳以后也会发生膨胀，进而变成一颗与“天鹤座 π”相似的红巨星。研究显示，太阳目前约50亿岁，正处于“青壮年期”，现状还可以维持约50亿年。在那之后，太阳将进入红巨星演化阶段。

　　报道称，“天鹤座 π”与地球相距530光年，根据拜耳命名法，其名称由希腊字母π和其所属星座“天鹤座”组成。根据拜耳命名法，一颗恒星的名字由两部分构成，一部分为希腊字母，代表恒星的亮度等级，另一部分是恒星所属星座的名称。一般来说，α星是每个星座中最亮的一颗星。

　　由克劳迪娅·帕拉迪尼率领的这个天文学家团队利用欧洲南方天文台设在智利的甚大望远镜的PIONIER设备对“天鹤座π”进行观测，发现其表面有一些相互交错的板块结构，其中有的板块长度甚至接近该星直径的四分之一。

　　天文学家称，这种特殊结构可能是在“天鹤座π”由恒星演化为红巨星的过程中形成的，这种细节以前从未被观测到过。

laiyuan :xinhuawang

West medium: scientists have observed the details of the evolution of the red giant star in the future of the sun.

According to the 20 research report published in the journal Nature, a team of scientists from the European Southern Observatory observed the unprecedented details of a red giant's surface change process.

According to EFE reported on December 20th, the red star is "old" stage of the stars, the volume will expand to very great degree, the outer gas density is low, the surface temperature decreased, looks like a red, red star is an unstable stage to the late star combustion experience.

Reported that the red giant star called Grus PI (Pi Gruis), and the quality of the sun, but the diameter is 350 times larger than the sun.

The team of scientists said, the sun will swell, and then become a "Grus Pi" similar to the red giant. The study shows that the sun is about 5 billion years old and is in "green years", and the current situation can be maintained for about 5 billion years. After that, the sun will enter the stage of the evolution of the red giant.

Reported that the "Grus Pi" and the earth 530 light-years apart, according to the Bayer designation, the name by the Greek letter PI and the constellation "Grus". According to the Bayer naming method, the name of a star is made up of two parts, one is the Greek alphabet, representing the brightness level of the star, and the other is the name of the constellation of the star. In general, the alpha star is the brightest star in every constellation.

Led by Claudia Paladini, the team of astronomers using the European Southern Observatory in Chile to the very large telescope PIONIER device to observe the "Grus Pi", found on the surface of some staggered plate structure, some of them even closer to the star plate length diameter 1/4.

Astronomers say that this special structure may be formed in the process of stellar evolution by Grus Pi as red giant in the details, has never been seen before.