CONSTRAINTS ON THE VELOCITY AND SPATIAL DISTRIBUTION OF HELIUM-LIKE IONS IN THE WIND OF SMC X-l FROM OBSERVATIONS WITH THE XMM-NEWTON REFLECTION GRATING SPECTROMETER

摘要

We present here X-ray spectra of the HMXB SMC X-l obtained in an observation with the XMM-Newton observatory beginning before eclipse and ending near the end of eclipse. With RGS on board XMM-Newton, we observe emission lines from hydrogen-like and helium