Both. A subgiant can be a young star (1,000 years old) to an old star (10 billion years old).
See related question.
A subgiant star is bigger than a neutron star. Neutron stars are incredibly dense and compact, with a radius of about 10-15 kilometers, while subgiant stars have a larger radius of several million kilometers.
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
Apparent magnitude: +2.9Absolute magnitude: -0.7See related question.
Zeta Herculis is a binary star system in the constellation Hercules.It has a class of G0V which means it is similar to our Sun but is moving away from the main sequence.It's companion star is a class K0V
Algol is a binary star system located approximately 93 light-years away from Earth. The primary star, Algol A, is a blue-white subgiant star with around 3 times the mass of the Sun, while the secondary star, Algol B, is a smaller main sequence star. The system has a combined apparent magnitude of about 2.1, making it one of the brightest stars in the night sky.
A subgiant star is bigger than a neutron star. Neutron stars are incredibly dense and compact, with a radius of about 10-15 kilometers, while subgiant stars have a larger radius of several million kilometers.
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Dubhe is not a red giant but rather a subgiant star. It is the brightest star in the Big Dipper asterism and is classified as an evolved F-type subgiant star.
A binary star. The main component is a Be-type subgiant.
A subgiant star is larger than a neutron star. Neutron stars are incredibly dense and compact remnants of massive stars, while subgiant stars are in a transitional phase between main sequence and red giant stages, typically larger and more diffuse than neutron stars.
Sarin is not a type of star; it is a highly toxic chemical compound known as a nerve agent.
A subgiant is a class of star that is brighter than most normal dwarf main sequence stars but not bright enough to be classed as a giant.Eg. Procyon (α CMi / α Canis Minoris / Alpha Canis Minoris)
Rastaban is a binary star system in the constellation of Draco. The primary star is a yellow-white subgiant, while the secondary star is most likely a red dwarf.
Zeta Phe is a blue-white main sequence star that is approximately 610 light-years away from Earth. It is a subgiant star with a spectral type of B7 IV.
If you are referring to the Yerkes spectral classification, a Class IV star is known as a subgiant.
In star lives, there are no old blue stars. All blues stars are young.
neutron star is a stellar remnant so it is neither a young star nor an old star . It is formed by the gravitational collapse of massive star and are composed of neutrons . neutron star has a mass in between 1.35 to 2 solar masses