Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176..217m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 176, July 1976, p. 217-223.
Astronomy and Astrophysics
Astronomy
20
B Stars, Spaceborne Astronomy, Stellar Spectrophotometry, X Ray Sources, Correlation, Covariance, Optical Activity, Proportional Counters, Satellite-Borne Instruments
Scientific paper
The suggested association of X Persei with the weak X-ray source 3U 0352+30 raises the possibility of detection of X-ray/optical covariability. The paper reports a successfully conducted simultaneous optical/X-ray observation utilizing ground-based photometry and a satellite-borne proportional counter. Photoelectric photometry of X Persei was obtained on five out of seven consecutive nights in January 1975. The observations yield the faintest and bluest photoelectric magnitudes and colors ever reported for X Per; this change apparently occurred relatively uniformly during 1973-74 and is reminiscent of behavior last observed in about 1900. On January 21, 7 hr of data were obtained simultaneously with OAO Copernicus X-ray observations of 3U 0352+30. The X-ray flux varied during this period by a factor of 2, but there is no obviously correspondent optical activity, to a level of 0.02 mag. The optical data are also used to limit the 0.01-mag variations coincident with the X-ray periodicity reported by White et al. (1976).
Bowyer Stuart
Margon Bruce
Penegor Gerald
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