absolute-magnitude
1.All limits are given according to the absolute-magnitude convention, with a few exceptions.
5.Accurate stellar trigonometric parallaxes may provide reliable data for studies on the physical properties and evolutional status of stars such as white dwarfs, red dwarfs, O and B stars, Herbig Ae and Be stars, and Ap and Am stars. Some fundamental parameters like absolute magnitude, effective temperature and radii of these stars and their positions in the HR diagram are of great importance in astronomical researches.
6.In this paper, we have statistically studied 495 radio galxxies, we have got the distributions of a, L and Z, and calulated the mean spectral index a and the mean absolute magnitude M. It has been found that L and a of radio galaxies are correlated to Z to different degree, L and a increase with Z.
8.ABSOLUTE PROPER MOTIONS AND COLOUR-MAGNITUDE DIAGRAMS OF THE GLOBULAR CLUSTER NGC 4147
9.Abstract: We have studied the polarization beats spectroscopy with phase-conjugation geometry in a cascade three-level system.It was found that the accuracy for the energy-level difference measurement is determined by the homogeneous linewidths of the optical transitions.Under the condition for the occurrence of beating,the frequency difference of the beat between two independent light sources could exceed the laser linewidth.The measurement accuracy for laser absolute frequency could reach the same order of magnitude as the laser linewidth.
10.Reflectances from the abaxial surfaces were greater than that from the adaxial surfaces in the visible and near infrared region at tillering, booting and flowering stage. The absolute difference (mostly below 2%) between the two surfaces was not considerably influenced by nitrogen availability and growth stage in the visible region, but the magnitude of differences in the near infrared region decreased with the growth stage.
