A NEW MEASUREMENT OF THE HER X-1 X-RAY PULSE PROFILE

摘要

We have measured a triple-peaked 1.24 sec. pulse profile in a 1 minute rocket borne exposure to Her X-l, in contrast to the double peaked profiles expected from models which maximize the X-ray emission at the magnetic equator of an accreting neutron star. The profile exhibits statistically significant energy dependence, with the emission ＞ 12 keV having narrower peaks which lag (by approximately 5% of the pulse period) the corresponding peaks at lower energies. Approximately one-third of the total emission from the source is non-pulsed.