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Period Changes in the X-ray Pulsar GX 1 + 4

Published online by Cambridge University Press:  25 April 2016

J. G. Greenhill ,
A. B. Giles ,
D. P. Sharma ,
D. M. Warren ,
A. Sprent ,
M. W. Emery ,
S. W. B. Dieters ,
K. B. Fenton ,
R. K. Sood  and
L. M. Waldron
...Show all authors
J. G. Greenhill
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
A. B. Giles
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
D. P. Sharma
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
D. M. Warren
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
A. Sprent
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
M. W. Emery
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
S. W. B. Dieters
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
K. B. Fenton
Affiliation:
Physics Dept, University of Tasmania, Hobart, Tasmania 7001
R. K. Sood
Affiliation:
Physics Dept, University College, ADFA, Canberra, ACT 2600
L. M. Waldron
Affiliation:
Physics Dept, University College, ADFA, Canberra, ACT 2600
J. A. Thomas
Affiliation:
Physics Dept, University College, ADFA, Canberra, ACT 2600
O. Mace
Affiliation:
Physics Dept, University College, ADFA, Canberra, ACT 2600
R. K. Manchanda
Affiliation:
Physics Dept, University College, ADFA, Canberra, ACT 2600
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Abstract

The binary X-ray source GX 1 + 4 was observed during a balloon flight in 1986, November. The source was in a relatively high intensity state. Time analysis of the data shows that the pulsation period was 111.8 ± 1.0 s indicating that one or more episodes of spin-down occurred between 1980 and 1986. Folded pulse profiles are very broad with an indication of a notch at the peak. Evidence has been found for a correlation between hard X-ray intensity and phase of the proposed 304 day orbital period. The time averaged intensity since 1980 is an order of magnitude lower than during the 1970’s. A survey of the post 1980 data shows that several reversals of the period derivative have occurred. Spin-up at the rates typical of the 1970’s has been followed by a dramatic spin-down episode with dP/dt>2.4 × 10−7 s/s.

Type
Pulsars
Information
Publications of the Astronomical Society of Australia , Volume 8 , Issue 2 , 1989 , pp. 166 - 168
Copyright
Copyright © Astronomical Society of Australia 1989

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