Which star has the largest radius?
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun.
Where are the most massive stars on the HR diagram?
The giant branch and supergiant stars lie above the main sequence, and white dwarfs are found below it. There are 3 main regions (or evolutionary stages) of the HR diagram: The main sequence stretching from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) dominates the HR diagram.
Where are the hottest stars on the HR diagram?
A plot of the nearest stars on the HR diagram is shown below: Most stars in the solar neighborhood are fainter and cooler than the Sun. There are also a handful of stars which are red and very bright (called red supergiants) and a few stars that are hot, but very faint (called white dwarfs).
How do you find the radius of a star?
A star is well approximated by a SPHERICAL blackbody (surface area = 4 pi R^2), so the formula which gives the total luminosity of a star is the following: Thus, if we know the luminosity L* of a star (found from its intensity and its distance) and if we know the temperature T* of a star, we can compute its radius R*.
Which star has the smallest radius?
The smallest known star right now is OGLE-TR-122b, a red dwarf star that’s part of a binary stellar system. This red dwarf the smallest star to ever have its radius accurately measured; 0.12 solar radii. This works out to be 167,000 km.
What color are the hottest stars?
blue
What is the radius of a star?
The surface area of a star is directly related to the square of its radius (assuming a spherical star). (5.67 x 10-8 Wm-2K-4), and T is the star’s surface temperature in Kelvin. The temperature of a star is related to its b-v magnitude.
Photo in the article by “Wikipedia” https://en.wikipedia.org/wiki/Mu_Cephei