PSR B1259-63is a γ-ray emitting high mass X-ray binary system,in which the compact object is a millisecond pulsar.The system has an orbital period of 1236.7d a
This work reports the first discovery of(negative) spectral lags in X-ray emission below 10 ke V from the gamma ray binary LS I+61?303 during large flaring epis
Based on long-term high-resolution spectroscopic observations obtained during five observing runs from 2001 to 2004,we study optical flare events and chromospheric activity variability of the very act
In this study, new photometric observations of shallow contact binary CN Andromedae(CN And)were performed and multi-color(BV R) CCD light curves(LCs) were obtai
The study of kiloparsec-scale dual active galactic nuclei(AGN) provides important clues for understanding the co-evolution between host galaxies and their central