Long term X-ray observations of systems with unusual optical counterparts and modulation measurement of selected astronomical sources

Details Long term X-ray observations of systems with unusual optical counterparts and modulation measurement of selected astronomical sources Long term X-ray observations of systems with unusual optical counterparts and modulation measurement of selected astronomical sources

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ucb..rept.....b&link_type=abstract

Final Technical Report California Univ., Berkeley. Space Sciences Lab.

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Binary Stars, Light Curve, Stellar Radiation, X Ray Astronomy, Astronomical Spectroscopy, Ellipticity, Modulation, Oao 3, Radial Velocity

Scientific paper

The OAO-3 satellite was used for several months' observation of the loss mass X-ray binary sources 2A18822-371 and 4U2129+47 in a search for variability similar to the 35 day on-off cycle observed in Her X-1. The related system Cyg X-2 was observed both optically and in X-rays covering one complete binary cycle of 9.8 days. The UCL X-ray telescope observations revealed no periodities nor obvious variability other than the known orbital periods; however, the ground-based optical spectroscopy supports the interpretation of the photometry periodicities as representing orbital motion in 2A1822-371 and detected radial velocity motions on the photometric period in 4U2129+47. The shape and the length of the 4.8 hour periodicity in the X-ray emission from Cyg X-3 was also studied. The quality OAO-3 data obtained to measure the light curve and look for a change in the period and/or obtain improved measurement of the slope of the light curve was insufficient.

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