It can be a black hole or a Neutron Star
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The remains of a high mass star could be a neutron star or a black hole, depending on the mass of the original star. Neutron stars are extremely dense and compact objects, while black holes are regions of spacetime where gravity is so strong that nothing, not even light, can escape.
The small dense remains of a high mass star are either a neutron star or a black hole, depending on the mass of the original star. Neutron stars are formed from the core collapse of a massive star and are incredibly dense, composed mainly of neutrons. Black holes are formed when the core collapse results in a singularity with infinite density and a gravitational pull so strong that not even light can escape.
The small dense remains of a high-mass star are called neutron stars or black holes, depending on the mass of the star. Neutron stars are formed when the core collapses under its own gravity, while black holes are formed when the core collapses into a singularity.
High mass.
A low mass star will become a white dwarf star, eventually this will cool to become a black dwarf. A high mass star (at least 8 times the mass of our Sun) will form a neutron star or a black hole, after a supernova event.
Altair is classified as an A-type main-sequence star, which means it is relatively high-mass compared to other stars like the Sun. Its mass is estimated to be about 1.8 times that of the Sun.