Observation of an outburst from the X-ray pulsator 0115+63

Astronomy and Astrophysics – Astronomy

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Ariel Satellites, Emission Spectra, Spin Reduction, Stellar Rotation, X Ray Sources, Orbital Elements, Pulse Duration, Spin Dynamics

Scientific paper

The Ariel 6 X-ray instruments observed 0115+63 during Dec. 16-30, 1980 when the mean flux was about 150 millicrab. Analysis of the approximately 3.6 s pulsations given a refined orbital period of 24.3155 plus or minus 0.0002 days and a periastron angle of 47.15 deg plus or minus 0.13 deg, setting a limit on the rate of advance of periastron since 1978 of 0.11/yr. During the observation the pulse period was decreasing faster than during the 1978 outburst, but in the three year interval there had been a spin down.

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