Observations of bright stars with AstroSat soft X-ray telescope

Statistical Study of Solar X-Ray Jets Observed with the Yohkoh Soft X-Ray Telescope

We have found 100 X-ray jets in the database of full Sun images taken with the Soft X-ray Telescope (SXT) aboard Yohkoh during the period from 1991 November through 1992 April. A statistical study for these jets results in the following characteristics: 1) Most are associated with small flares (microflaressubflares) at their footpoints. 2) The lengths lie in the range of a few x 10-4 x 10 km. 3...

The Origin of Bright X-Ray Sources in Multiple Stars

Luminous X-ray stars are very often found in visual double or multiple stars. Binaries with periods of a few days possess the highest degree of coronal Xray activity among regular, non-relativistic stars because of their fast, tidally driven rotation. But the orbital periods in visual double stars are too large for any direct interaction between the companions to take place. We suggest that mos...

X ? Ray Photon Spectroscopy with the Yohkoh Soft X ? Ray Telescope

Individual X ? ray photons in the keV energy range produce hundreds of photoelectrons in a single pixel of a CCD array detector. The number of photoelectrons produced is a linear function of the photon energy, allowing the measurement of spectral information with an imaging detector system. The Yohkoh Soft X ? ray Telescope uses a CCD in an integrating mode and makes temperature estimates from ...

X-Ray Observations of Neutron Stars with XMM-Newton & Chandra

Swift Observations of the X-ray–bright Grb 050315

This paper discusses Swift observations of the -ray burst GRB 050315 (z 1⁄4 1:949) from 80 s to 10 days after the onset of the burst. The X-ray light curve displayed a steep early decay (t ) for 200 s and several breaks. However, both the prompt hard X-ray/ -ray emission (observed by the BAT) and the first 300 s of X-ray emission (observed by the XRT) can be explained by exponential decays, wit...