PU Vul was discovered by Honda (1979) and Kuwano (1979) due to its conspicuous increase of brightness in the years 1977–79. The analysis of the archive data by Liller and Liller (1979) revealed that the star was about 16.0m –16.5m since the year 1898 until October 1977, with occasion...
a相对于遥感影像中的其他区域(水体对象),阴影区域在HIS颜色空间具有亮度值低、饱和度高的特点 Is opposite in the remote sensing phantom other regions (water body object), the shadow region has the luminance value lowly in his color space, the degree of saturation high characteristic[translate]...
sech(z)-model of brightness decrease (de Grijs and van der Kruit 1996) . The thickness z 0 , or the vertical disk scale height, is primarily determined by the local disk density and stellar velocity dispersion. However, as we can see in our own Galaxy, young and old stars have diff...
Variations in amplitude of one harmonic relative to others could be a valuable probe of density distribution and the flow of mass in the disk. In particular we should be able to follow the large changes in brightness (from magnitude 17.2 to magnitude 13) and in this way and determine its ...
Thus, it would be desirable to determine the maximum brightness of an object, e.g., through a calibration, so that the brightness of the object's IR reflection can be related to the height of the object above the display surface. It would also be desirable to know precisely when an ...