The improved schemes with adding pseudo satellites based on the actuality to get more observed quantities are presented in this paper and optimum layout of the pseudo satellites is also pointed out 通过仿真对三星定位系统的gdop特点进行了研究。本文提出在现有双星系统基础上增加伪卫星伪距观测量的改进方案,并对方案中的伪卫星进行最佳配置。
In the accretion disks in binary systems or at the centers of galaxies , particle collisions would produce an inflow of mass that is too small by many orders of magnitude to produce the brilliant luminosity of these disks 在双星系统或星系中心的吸积盘中，粒子的碰撞只会引起很少的质量向内流动，距离要产生可达到这些圆盘的耀眼亮度，还差了许多个数量级。
But given that exoplanets could well form in many different ways , astrophysicists believe that taking a closer look at the neglected majority of double stars may reveal a galaxy full of new worlds 但是，考虑到通过许多不同的方式能够形成完整的系外行星，天体物理学家们相信将目光移近那些过去一直被忽略的大量双星系统中，可能会在银河系中发现新行星到处都是。
Sometimes , in a binary star system , one star will pass in front of the other producing what we call eclipsing binary . it can be treated as a special kind of visual binary . eclipsing binary systems are variable stars see below ：有些双星系统，其中一颗星会在另一颗星前经过，产生周期性的光度变化，我们称这种双星为食双星，基本上我们可以把食双星看成为目视双星的一种。
The discovery of isolated black holes agrees with the stellar evolution theory that black hole can be formed naturally when a massive star collapses under its own gravitation . binary system is not a necessary for its formation 黑洞可以孤立地存在，暗示著黑洞并不一定需要存在于双星系统，而可以透过孤立的大型恒星的重力塌缩而产生，这正是一直以来恒星演化理论所预期的结果。
Most astronomers accept the binary spin - up scenario for creating millisecond pulsars because they have observed neutron stars speeding up in x - ray binary systems , and almost all radio millisecond pulsars are observed to be in binary systems 多数天文家接受这个假想的模式，因为他们已经在x射线双星系统中观测到了中子星的加速现象，而且几乎所有的毫秒脉冲星都被发现时处于双星系统中。
In a binary system , situations may become more complicated . for example , it could happen that one has evolved to a white dwarf figure to and the other is becoming a red giant . the two could be very closed to each other , maybe only about the earth - moon distance see figure to 在双星系统里，有可能其中一颗恒星已演化为白矮星参阅a图至d图，但另一颗恒星只达红巨星阶段，而它们之间的距离和地月距离差不多参阅d图至f图。
These events include two kinds of stellar explosions : ( 1 ) nova explosions , in which one of the two members of a binary star system hurls dust and gas into space ; ( 2 ) much more violent supernova explosions , in which a star collapses , then throws off most of its matter 这些事件包括两种类型的恒星爆发： （ 1 ）新星爆发，双星系统中的一员将气体和尘埃猛烈抛入太空； （ 2 ）更为猛烈的超新星爆发，那是一颗恒星崩溃时几乎把它所有物质都抛出去了。
In general , ba stars belong to binary system , and their heavy - element overabundances are due to the accreting material from the companions ( the former tp - agb stars and the present white dwarfs ) . carrying out a series of monte - carlo simulations , the changes of orbital elements of binaries are recalculated for wind accretion scenario of the total angular momentum conservation 研究表明，钡星应该属于双星系统，其重元素超丰来自双星吸积，它的伴星已经经历了s -过程核合成，而且由在以前发生的同其伴星(以前是agb星，现已演化为白矮星)的质量传输过程中，从伴星那里获得了富含重元素的物质，这样造成了钡星的重元素超丰。
Therefore , it is very significant to find the way of realizing passive positioning . a method of the region passive pseudolites positioning based on geostationary satellite positioning system is presented . firstly , the positioning theory and method are discussed and the positioning accuracy is analyzed 本文首先讨论了系统的定位原理以及定位方法，通过仿真分析比较了双星系统增强前后定位精度的改进，详细分析了影响伪卫星基站布站的几个因素，确定了基站的布站方案。
