用于变星和晕研究的多色“天琴座”测光系统
The Multicolor "Lyra" Photometric System for Variable stars and Halo Studies
摘要：
俄罗斯目前正在开发空间光度测量项目“天琴座”，该项目的目的是确定自然和人造空间物体的光度测量信息和坐标，从最亮的物体到可见光下的16 μ m物体。它应该从国际空间站上获得大约40-400万个物体的数据，使用主镜直径为0.5米的天文望远镜。观察将以扫描方式进行。将在10个光谱带中进行光度测定。在V波段，16米天体的星等的预期不确定度为0.001米。实验的主要结果是：1）建立距太阳3 kpc的银河系空间模型; 2）确定恒星的物理参数和恒星演化模型; 3）发现大量（数百万）变星并确定其变率参数。“天琴座”测光系统的10个波段的中心波长分别为195、218、270、350、440、550、700、825、930和1000 nm。它示出的各种颜色指数的组合将允许自信地确定恒星的有效温度和金属丰度。218 nm波段的存在使得我们可以确定O-F光谱类恒星的星际消光。测光系统将使人们有可能从盘星中分离出晕星，并确定其大气层的物理参数。
英文摘要：
The space photometric project "Lyra" is developed now in Russia.The project purpose is determination of the photometric information and coordinates of the natural and artificial space objects, from the brightest ones to 16^m in visual lights. It is supposed to obtain the data for about 40-400 million objects from board of International Space Station, using an astronomical telescope with diameter of the main mirror of 0.5 m. The observations will be carried out in a scanning mode. Photometry will be obtained in 10 spectral bands. The expected uncertainty of magnitudes for objects of 16^m in the V-band is 0.001^m. The main results of experiment should become: 1) creation of spatial model of the Galaxy on distances to 3 kpc from the Sun; 2) specification of physical parameters of stars and models of star evolution; 3) discovering of a huge number (to several millions) of variable stars and determination of their variability parameters. The central wavelengths of the 10 bands of "Lyra" photometric system will be at 195, 218, 270, 350, 440, 550, 700, 825, 930 and 1000 nm. It is shown that combinations of various colour indices will allow to determine confidently both effective temperature and metallicity of stars. The presence of a 218 nm band allows to determine confidently interstellar extinction on stars of O-F spectral classes. The photometric system will make it possible to separate halo stars from disk stars and to define physical parameters of their atmospheres.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
