Resumed spin-up in GX 1+4

Details Resumed spin-up in GX 1+4 Resumed spin-up in GX 1+4

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208l...1g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. L1-L4. Research supported by the Australian Resear

Astronomy and Astrophysics

Astrophysics

18

Pulsars, Stellar Orbits, Symbiotic Stars, X Ray Sources, M Stars, Periodic Variations, Spin Dynamics, Stellar Rotation

Scientific paper

The X-ray source GX 1+4 was observed during a balloon flight in November 1986. The source was in a relatively high intensity state. The time analysis of the data shows that the pulsation period was 111.8 + or - 1.0 sec, 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. A survey of data since 1980 shows that GX 1+4 is again spinning up at an average rate (6.6 + or - 0.1) x 10 to the -8th sec/sec, similar to that during the 1970s. Evidence has been found for a correlation between hard X-ray intensity and phase of the proposed 304-day orbital period.

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