Her X-1: A Processing Binary Pulsar?

Details Her X-1: A Processing Binary Pulsar? Her X-1: A Processing Binary Pulsar?

Oct 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972natur.239..325b&link_type=abstract

Nature, Volume 239, Issue 5371, pp. 325-326 (1972).

Computer Science

66

Scientific paper

RECENT observations of the two pulsating binary X-ray sources Her X-1 (ref. 1) and Cen X-3 (ref. 2) have led to a great deal of speculation about the X-ray emission mechanism involved. Because orbital parameters have been derived from their respective Doppler curves implying orbital radii R0 of only 1011 to 1012 cm, it is natural to suppose that matter is accreted on one star from its companion. In the case of Cen X-3 with one binary member a massive star3 (~15 Msolar), the low-mass companion (M<~0.1-1 Msolar) is presumably a collapsed object with high surface gravity (either a white dwarf, neutron star or black hole). So a large source of gravitational energy is tantalizingly available for radiation. If this were released during accretion of gas on the collapsed star (with mass M and radius R) at a rate dm/dt, the resulting steady state luminosity L~(GM/R) (dm/dt). Even for a modest mass transfer rate, 2023 g yr-1, the maximum probable X-ray luminosity Lx~1036 erg s-1 can be accommodated (assuming GM/Rc2~10-1 as in a neutron star).

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