A technique for timescale analysis of spectral lags performed directly in the time domain is developed. Simulation studies are made to compare the time domain t
87 stars in the NGC 6913 field with both UBV and Vilnius photometry are selected to be the sample. The membership probability of the stars is greater than 50%.
<正>We reported recently some rapid changes of sunspot structure in white-light(WL) associated with major flares.We extend the study to smaller events and prese
We determine the mass, age and kinematics of 51 extra-solar planet host stars. The results are then used to search for signs of connection of the data with meta
The chemical classification of IRAS 17515-2407 has been debated for a long time. Up to now there are two contenders, oxygen-rich or carbon-rich. We believe that