13.9-minute periodicity in X Persei /possibly identical with 3U 0352 plus 30/

Details 13.9-minute periodicity in X Persei /possibly identical with 3U 0352 plus 30/ 13.9-minute periodicity in X Persei /possibly identical with 3U 0352 plus 30/

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pasp...88..754h&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 88, Oct.-Nov. 1976, p. 754-758.

Astronomy and Astrophysics

Astronomy

11

B Stars, Periodic Variations, Variable Stars, X Ray Sources, Emission Spectra, Fourier Analysis, H Beta Line, Luminous Intensity, Power Spectra, Signal To Noise Ratios, Spectrum Analysis

Scientific paper

Observations were made with a 1.2-m telescope coude spectrograph and an Image Isocon camera of the spectrum of X Per at 4686 A and H beta to look for 13.9-minute periodic changes, observed previously in the X-ray source 3U 0352 plus 30, in order to confirm the optical identification. From the data, it appears that over regions of 2 A or less, associated with these wavelengths, periodic changes modulo 13.9 minutes are not seen above the 2 percent level. Changes below this level are indicated in the power spectra, but are not of high statistical significance.

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