x-ray star

plural x-ray stars

1. nonstandardAlternative letter-case form of X-ray star.

plural X-ray stars

1. A luminous celestial object that emits a major portion of its radiation in the form of X-rays.

   [...] and the prediction, now widely accepted, that an x-ray star is a close stellar pair, one of which is a neutron star.

   1985, Carl Segan, I. S. Shklovskil, 1916-1985

   1 more example

   A high-resolution imager located in the focal plane at launch had transmitted to earth Nov. 18 the first picture ever of an x-ray star and had sent many such pictures since then.

   1978, National Aeronautics and Space Administration, “Astronautics and Aeronautics”, in Governing the Moon: A History

   1. An X-ray binary.
   2. An X-ray pulsar, a rotating neutron star that sweeps an X-ray beam toward Earth.