HER X-1: correlated variability of the 1.24 SEC and 35 day periods

Details HER X-1: correlated variability of the 1.24 SEC and 35 day periods HER X-1: correlated variability of the 1.24 SEC and 35 day periods

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.1204s&link_type=abstract

American Astronomical Society, 190th AAS Meeting, #12.04; Bulletin of the American Astronomical Society, Vol. 29, p.793

Astronomy and Astrophysics

Astronomy

Scientific paper

Both the 1.24 sec pulsational period and the 35 day turn-on period of Her X-1 show long-term variability. It is shown that both periods vary in a highly correlated way: when the spin-up rate drops the 35 day precessional period gets shorter. This correlation is most evident on long time scales ( 2000 days), e.g. during two extended spin-down episodes, but also on shorter time scales (a few hundred days) on which quasi-periodic variations are apparent. The likely common cause are variations of the rate of mass accretion onto the neutron star. A physical explanation within the framework of the coronal wind model is proposed. Further details on the jitter of the 35 day clock will be discussed.

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