High-Energy Astrophysics American and Soviet Perspectives/Proceedings from the U.S.-U.S.S.R. Workshop on High-Energy Astrophysics (1991) / Chapter Skim
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OBSERVATIONS OS X-RAY PULSARS FROM THE KVANT MODULE
OBSERVATIONS OS X-RAY PULSARS FROM THE KVANT MODULE
Pages 134-143
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From page 134... ...
The values of the periods are reduced to the solar * Space Research Institute, Academy of Sciences, Moscow, USSR; Space Research Laboratory, Utrecht, Ihe Netherlands; Department of Space R=earch, University of Birmingham, Edgbaston, Birmingham; Max Planck f~r Physik and Astrophysik, Institute f~r Extraterrestrische Physik, Astronomisches Institute der Unive~sitat ~bingen, Garshing, Germany; Noordwijk Ihe Netherlands.
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From page 135... ...
CRAB NEBULA PULSAR OBSERVATIONS More than 100 among 2000 sessions performed until now by the Roentgen observatory were shared with the Crab Nebula Observations in order to calibrate all instruments. The reduction of time series from the Kvant module to UT (Universal Time)
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From page 136... ...
Of the measured values from the fit are within statistical errors PIP 1 10-7. These measurements of the NP0532 pulsation period and comparisons with the radiodata confirmed the correctness of all timing analysis procedures, which were applied below for other pulsars.
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. The time of the sessions when there is no significant flux from the source coincides with the predicted time of the eclipse based on the orbital parameters of Gruber (1988~.
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The solid line shows the predicted Doppler shift of period due to the neutron star motion in the binary system according to parameters from Nagase et al. (1983~; Nagase et al.
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From page 139... ...
Companson of the periodic values measured in single sessions with the predicted Doppler shifts due to orbital motion confirmed the stabilibr of the binary system parameters since the last measurements of Mama in 1983 (Nagase et al.
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- COB 8 - ~s _ ED ~ _ Co Tic - TENS& O - VIA lo - KVANT 1 ~ .1. , 4000 5000 6000 7000 soon Date pro 2440000 + FIGURE 5 Pulsation period history for Cen X-3.
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From page 141... ...
O .1 .2 .3 \1 eel Jose · , I , ~, I . .4 .5 .6 .7 Orbi tal phase .8 .9 ~ FIGURE 6 Doppler shift of the periods due to orbital motion in binary system for Cen X-3 (a)
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From page 142... ...
2000 3000 4000 5000 6000 7000 8000 Date JO 2440000 ~ . FIGURE ~ Puls-penod history for Vela X-1.
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From page 143... ...
1988. Sonet Astronomy Letters.
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