Luminosity dependent changes of pulse profiles in the X-ray binary GX 1+4

Details Luminosity dependent changes of pulse profiles in the X-ray binary GX 1+4 Luminosity dependent changes of pulse profiles in the X-ray binary GX 1+4

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15..254g&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 2, p. 254-258

Astronomy and Astrophysics

Astronomy

5

X-Ray Stars, Accretion Disks, Gx 1+4 Pulsar

Scientific paper

We have reviewed the X-ray pulse profiles from a large number of observations of the accreting binary pulsar GX 1+4 obtained during the last 25 years. The profiles cover various energy ranges between 1 and 100 keV. Using these data we present a coherent picture of present and past pulse profiles and the variations of these pulse profiles with time. The pulse shape is dependent on both the X-ray luminosity and whether the pulsar is spinning up or down. Profiles measured during the GX 1+4 high state in the 1970s are all trailing edge bright. Subsequently the profiles have generally been symmetric or leading edge bright. Rossi X-ray Timing Explorer (RXTE) satellite data taken in July 1996 show that similar pulse shape variations can occur on a timescale of hours. The implications of this new information for accretion models is discussed.

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