Characteristics of the CEN X-3 neutron star from correlated spin-up and X-ray luminosity measurements

Details Characteristics of the CEN X-3 neutron star from correlated spin-up and X-ray luminosity measurements Characteristics of the CEN X-3 neutron star from correlated spin-up and X-ray luminosity measurements

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88....8v&link_type=abstract

Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 8-14.

Astronomy and Astrophysics

Astrophysics

19

Binary Stars, Neutron Stars, Stellar Luminosity, X Ray Sources, Centaurus Constellation, Cos-B Satellite, Light Curve, Luminous Intensity, Stellar Mass, Stellar Models

Scientific paper

Results are presented of one month of observations with the ESA COS-B satellite of the X-ray pulsation period of Cen X-3, together with X-ray luminosity measurements during this same time.
The data are shown to be compatible with an unbraked spin-up by accretion from a Keplerian disk onto a neutron star with f = 4μ2/730R6/745(M/Msun)-3/7 = 1.65 ± 0.44 and no braking occurring down to a luminosity of Lx = 4.21037 erg/s. The mean intrinsic luminosity during an observed turn-on episode is calculated from the high observed spin-up as Lx = (9.0 ± 2.6)1037 erg/s, which together with the long term behaviour of the pulsation period shows that certain low states of the source are in fact periods of high accretion.
It is argued that some current neutron star models are irreconcilable with the value off determined in this paper. The present f determination is shown to imply a lower mass limit for the Cen X-3 neutron star of 1.1 Msun.

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