Photometry of slow X-ray pulsars. II - The 13.9 minute period of X Persei

Details Photometry of slow X-ray pulsars. II - The 13.9 minute period of X Persei Photometry of slow X-ray pulsars. II - The 13.9 minute period of X Persei

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..504m&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Dec. 1, 1977, p. 504-510.

Astronomy and Astrophysics

Astronomy

22

Pulsars, Stellar Spectrophotometry, Visual Photometry, X Ray Sources, B Stars, Binary Stars, Emission Spectra, Light Curve, Line Spectra, Spaceborne Astronomy

Scientific paper

Results are presented for time-resolved narrow-band photometry and spectrophotometry of X Per performed in an unsuccessful effort to confirm previously reported observations of 13.9-min pulsations in the intensity of the He II line at 4686 A. No features that are synchronous with a 13.9-min period are found in the optical data, and simultaneous X-ray observations of 3U 0352+30 are reported which show that a strong 13.9-min X-ray modulation was present during the optical photometry. Some implications of the X-ray periodicities observed for X Per are considered.

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