A second neutron star in M4?

Details A second neutron star in M4? A second neutron star in M4?

2012-03-27

arxiv.org/abs/1203.5971v1

ApJ, 750, L3, 2012

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 4 figures, accepted by ApJ Letters

Scientific paper

10.1088/2041-8205/750/1/L3

We show that the optical counterpart of the X-ray source CX 1 in M4 is a 20th magnitude star, located in the color-magnitude diagram on (or very close to) the main sequence of the cluster, and exhibiting sinusoidal variations of the flux. We find the X-ray flux to be also periodically variable, with X-ray and optical minima coinciding. Stability of the optical light curve, lack of UV-excess, and unrealistic mean density resulting from period-density relation for semidetached systems, speak against the original identification of CX 1 as a cataclysmic variable. We argue that the X-ray active component of this system is a neutron star (probably a millisecond pulsar).

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