This binary X-ray transient system, XTE J1650-500, component black hole, at 3.8 solar masses, is smaller than the previous recordholder GRO J1655-40 B of 6.3 MSun in the microquasar system GRO J1655-40.
This red dwarf is slightly larger than the planet Saturn. As of 2017, it is the smallest hydrogen-fusing star known, marginally heavier than the hydrogen burning mass limit separating stellar objects and the sub-stellar brown dwarfs. Although its mass is comparable to that of TRAPPIST-1A, its radius is 1/3 smaller.
Brown dwarfs are not true stars as they are not massive enough to build up the pressure in the central regions to allow nuclear fusion of hydrogen into helium. They are best described as extremely massive gas giants that were not able to ignite into a star.
White dwarfs are stellar remnants produced when a star with around 8 solar masses or less sheds its outer layers into a planetary nebula. The leftover core becomes the white dwarf. It is thought that white dwarfs cool down over quadrillions of years to produce a black dwarf.
Neutron stars are stellar remnants produced by stars with around 9 solar masses or more explodes in a supernova at the end of its life. They are usually produced by stars with less than 20 solar masses, although a more massive star may produce a neutron star in certain cases. PSR B0943+10 is one of the least massive stars with 0.02 solar masses.
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