Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..770s&link_type=abstract
Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 770-775. Research supported by the Ruth and Albert Abramson Foundati
Astronomy and Astrophysics
Astrophysics
15
Heao 1, Neutron Stars, Pulsars, Stellar Models, Stellar Oscillations, X Ray Sources, Autocorrelation, Collimators, Fourier Analysis, Power Spectra
Scientific paper
The known X-ray source 1H 1909+096 was detected in a state of high intensity on Oct. 15, 1977, when 5 ms accumulation data was transmitted by the HEAO A-1 experiment. During that time, this source was found to pulsate with a period of about 15.25 ms, which changed during the 10 s of scanning through the source. The expectation for this to occur at random was evaluated by epoch-folding the sets of data for the three passes with changing periods, and by Fourier-analyzing the data and observing the power spectrum, and was found to be very low. The motions of the earth and the satellite, and the bind width, were found not to affect the results. Some models are discussed, emphasizing nonradial g-mode oscillations and torsional oscillations in the solid crust of the neutron star.
Livio Mario
Sadeh Dror
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