Einstein SSS and MPC observations of AQL X-1 and 4U1820-30

Details Einstein SSS and MPC observations of AQL X-1 and 4U1820-30 Einstein SSS and MPC observations of AQL X-1 and 4U1820-30

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..459k&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 459-465 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

2

Data Processing, Heao 2, Light Curve, Pulse Rate, Stellar Oscillations, X Ray Sources, Data Acquisition, Neutron Stars, Pulse Duration, Pulse Duration Modulation, Radiation Measuring Instruments, Spectrum Analysis, Stellar Rotation, Time Measurement, X Ray Timing Explorer

Scientific paper

The results of timing and spectral analyses of the X-ray sources Aql X-1 (X1908+005) and 4U1820-30 (NGC6624) are reported using data obtained with the Einstein SSS (Solid State Spectrometer) and MPC (Monitor Proportional Counter) instruments. A classic type I burst was observed from Aql X-1 in both detectors and a coherent modulation with a period of 131.66 + or - 0.02 ms and a pulsed fraction of 10 percent was detected in the SSS data. There is no evidence for a loss of coherance during the approximately 80 sec when the burst is observable. The 2 sigma upper limit on the rate of change of the pulse period is 0.00005s/s. It is argued that an asymmetrical burst occurring on a neutron star rotating at 7.6 Hz offers a plausible explanation for the oscillation. The data from 4U1820-30 show that the amplitude of the 685 sec modulation, identified as the orbital period, is independent of energy down to 0.6 keV. The SSS data show that the light curve in the 0.6 to 4.5 keV band is smoother than at higher energies.

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