2000 to 4000 kelvin
A red giant star.
white dwarf if it has low mass Neutron star or Blackhole if it is massive enough to cause a red super giant
A red dwarf.
the mass of a red giant is 300 asses
The surface temperature of a red giant is, at most, 5000 Kelvin.
A red color, in a star, is associated with a low surface temperature.
A low mass star typically appears red in color due to its cooler surface temperature. This type of star is classified as a red dwarf and emits a reddish light compared to higher mass stars.
A red giant is a star, at a particular phase of its development. It can be a star that has approximately the mass of our Sun (the Sun is expected to become a red giant eventually), or several times that mass.
Orion is a constellation, not a star. Betelgeuse, the red giant at the left shoulder of Orion, is a supergiant.
According to wikipedia, A red giant is a luminous giant star of low or intermediate mass (roughly 0.5-10 solar masses) that is in a late phase of stellar evolution.
It depends on how old it is
A low mass star becomes a giant when it exhausts the hydrogen fuel in its core, causing the core to contract and heat up. This increased temperature allows hydrogen fusion to commence in a surrounding shell, leading to an expansion of the outer layers of the star. As a result, the star's outer envelope swells and cools, transforming it into a red giant. Eventually, the star will shed its outer layers, creating a planetary nebula, while the core remains as a white dwarf.