Luminosity Dependent Changes of Pulse Profiles in the X-ray Binary GX 1+4

Publications of the Astronomical Society of Australia

J. G. Greenhill¹ 

[1] D. Galloway

关键词: X-rays: stars;    accretion disks;    pulsars: individual: GX 1+4;   

DOI  :  10.1071/AS98254

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

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.

【 授权许可】

Unknown