In the solar corona, the magnetic flux rope is believed to be a fundamental structure that accounts for magnetic free energy storage and solar eruptions. Up to
We present long term optical variability studies of bright X-ray sources in four nearby elliptical galaxies with the Chandra Advanced CCD Imaging Spectrometer a
We have constructed a catalog containing the best available astrometric,photometric, radial velocity and astrophysical data for mainly F-type and G-type stars(c