用GIF图像对比，直观显示M31仙女星系【斗转星移】Proper_motion

http://www.starpointing.com/ccd/m31starmotion.html

发错版了，麻烦管理员移动

G版补充说明：
移动的都是银河系中的前景恒星，  "proper motion" 就是 自行 的意思。

Proper Star motion around the Andromeda Galaxy

Star positions of my recent shot of the Andromeda galaxy are compared with those of the POSS1 sky survey taken in mid 1950's. It is well known that almost all stars move with fast speeds through the galaxy and relative to each other but due to their large distances this is hard to appreciate. Although the image resolution of my shot was only about 3.2" per pixel, careful scanning of the image revealed almost 200 stars that obviously changed their relative positions. This change in position is called "proper motion". The proper motion is the linear representation of the real motion of stars observed by us.

Every arrow in the image is aligned approximately perpendicular to the motion of a star. Red arrows indicate star motion along the orientation of the galactical plane within a range of ± 45 degrees. The rough statistical analysis shows that just about 75% of all moving stars are within this range of the galactic plane. This might be reliable since the expected star motion should be larger parallel to the galaxy disk. Such a general trend of proper star motion was for example also found by C. Abad and K. Vieira (2005). They used to analyse more than 8000 stars catalogued by Hipparchos which were distributed all over the sky.

核心的西南方：



星系核心区域：



M110周边：



东南方向：



西南方向：



西面方向：

高手

哇，短短六十年不到，这么多的星星都发生了位移！

不是它们速度快，就是离我们比较近。

这个犀利了~看来一身可以看到不少变化呢。争取等再过50年继续看变化~~

牛逼，这个必须顶

那些红兰箭头是什么意思？红色的代表它们在远离我们，兰色代表离我们更近了？还是有其它的意思？

哦，看懂了，红色表示远离我们，而且数量是二十七倍于朝我们而来的恒星。

据说31已经和银河撞上了？

那么，这些移动了的星星一共是多少颗，与没有移动的比值是多少啊，哪位能算一下吗？

上面几楼在说什么啊，那些移动的都是银河系中的前景恒星，  "proper motion" 就是 自行 的意思。

至于M31要和银河系相撞，去看我发的另一个专题。企图从这样的图像中看出M31本身的自行，要求也忒高了点。M31运行所需要的背景，那是遥远的类星体或者极遥远的背景星系。

本文中M31本身是当做不动的（这点在本文中完全可行）。

渺小的人类短暂的一生，有幸还能看到变化中的无尽宇宙。

50年看得出自行的恒星应该全部是银河系的恒星，不可能是外星系的。

厉害啊

能看见的移动都是来源于前景星，也就是我们银河系的星星

不错！

这个很强

不停的移动会不会撞车