* Mass: Subgiants are stars that have exhausted their hydrogen fuel in their core and are transitioning to becoming giants. They're larger than main sequence stars of the same mass, but smaller than giants.
* Evolutionary Stage: A subgiant's size will depend on how far along it is in this transition.
General Size Range:
* Radius: Subgiants typically have radii 2-10 times larger than our Sun.
* Luminosity: They can be 10-100 times brighter than our Sun.
Example:
* Arcturus (in the constellation Boötes) is a subgiant star with a radius approximately 25 times larger than our Sun.
To summarize:
* Subgiants are "in between" main sequence stars and giant stars in size.
* Their size is directly related to their mass and stage of evolution.
If you have a specific subgiant star in mind, you can find more detailed information on its size and properties in astronomy databases.
