Fast coherent oscillations in variable X-ray sources and bursters

Details Fast coherent oscillations in variable X-ray sources and bursters Fast coherent oscillations in variable X-ray sources and bursters

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116..286l&link_type=abstract

Astronomy and Astrophysics, vol. 116, no. 2, Dec. 1982, p. 286-292.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Models, Bursts, Neutron Stars, Stellar Oscillations, Variable Stars, X Ray Sources, Accretion Disks, Periodic Variations, Stellar Envelopes, Stellar Rotation

Scientific paper

Coherent oscillations with periods of the order of tens of milliseconds have been reported from five variable X-ray sources or bursters. Possible mechanisms for the generation of the oscillations are examined. It is found that rotator models encounter difficulties in explaining period changes and short duration of periodicities. Oscillations of the neutron star's envelope, especially g-modes are found to give the most consistent general explanation. It is shown that it is unlikely that the pulsations originate in an accretion disk. Some observational tests are proposed and the resemblance of the observed oscillations with those in Cataclysmic Variables is pointed out.

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