GX 1+4: pulse period measurement and detection of phase-variable iron line emission

Details GX 1+4: pulse period measurement and detection of phase-variable iron line emission GX 1+4: pulse period measurement and detection of phase-variable iron line emission

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..759r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 201, Nov. 1982, p. 759-768. Research supported by the Science and Engin

Astronomy and Astrophysics

Astronomy

18

Emission Spectra, Iron, Line Spectra, Pulse Duration, Stellar Spectra, X Ray Sources, Abundance, Ariel Satellites, Fluorescence, Sine Waves, Spectral Line Width, X Ray Astronomy

Scientific paper

Observations of the X-ray source GX 1+4 (1728 - 247) made by Ariel 6 in 1979 July and 1980 April show that the pulse period decreased at a faster rate during 1978-80 than over the period 1970-78. Compared with that measured in 1976, the pulse profile had become more sinusoidal, with an apparent phase lag of 0.1 between the 4-8 keV pulse and that seen at energies above 25 keV. The 1-4 keV range does not show pulsations and is stronger than hitherto. There is also an iron emission feature whose equivalent width varies with pulse phase.

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