A Neutron Star is Unwinding a Companion Star - by briankoberlein
Smaller stars don’t create enough heat to fully cast off their hydrogen layer, but in close binary systems, a companion can strip the hydrogen layer from its partner, leaving a small stripped star known as a subdwarf. Astronomers have observed several high-mass stripped stars with masses of more than 10 Suns, and lots of low-mass examples with a mass of the Sun or less. What they haven’t seen is an intermediate-mass stripped star.
What makes this discovery important is that it shows a crucial stage in the evolution of merging stars. In the cosmically near future, the striped star will become a supernova before its core collapses into a neutron star. If the companion star survives this, the neutron star will eventually steal the hydrogen that was once stolen from it. The second star will be stripped, and will also become a neutron star or black hole.
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