4U 1822–371 is a typical edge-on eclipsing low mass X-ray binary and the prototype of accretion disk coronal sources. We report on the results of a spectral an
A new programmable prediction method is developed to refine the occultation band by taking into consideration the triaxiality of an occulting body, as well as t
The proper motions of 15 nearby(d < 1 kpc) open clusters(OCs) were recalculated using data from the UCAC4 catalog. Only evolved or main sequence stars inside a
New eclipse timings of the Z Cam-type dwarf nova AY Psc were measured and the orbital ephemeris was revised.In addition,based on long-term AAVSO data,the outbur