The large cool stars found at the upper right of the H-R diagram are stars?
Yes, They are cooler, yet larger. The larger the star, the higher on the diagram, and the cooler, the further right.
On a Hertzsprung-Russell Diagram, the stars that are of the largest radii are found mainly towards the upper right. They are "supergiant stars". Also, some supergiant stars are found around the centre of the upper region of the H-R diagram. These diagrams are essential in astronomy. They help to show some of a star's fundamental properties.
Why does the H-R diagram constructed from the data on the brightest stars differ so much from the diagram constructed data on the nearest stars?
In which of the letters on the horizontal axis of a Hertzsprung-Russell Diagram would you find the most stars?
The HR diagram has the star's temperature along the horizontal axis and the absolute magnitude (brightness) along the vertical axis. Each star is represented by a single dot. Higher temperature is usually associated with more brightness so many stars lie on or near a line on the diagram called the Main Sequence. Red giant stars are found on the upper right hand quarter because they are relatively cool but still very bright.
To simplify, the Hertsprung-Russel diagram has a slow reverse curve from upper left to lower right. Highest luminostiy is at upper left, lowest at lower right. Along that curve is a scattergram of "main sequence" stars, hottest at the top, coolest at the bottom. At the upper right is a separate grouping of "Giants" At the lower left is dwarfs.
Main Sequence blue giants such as Rigel are located on the left-hand side of the H-R diagram. The order is O B A F G K M, and these are spectral classes based on color and temperature. The hottest stars burn blue/white because blue light has the shortest wavelengths and the highest temperatures. Moderate stars like our sun, a type G star, are found in the center of the Main Sequence, and red dwarf stars…
Every star, except black holes (if you consider them stars) & neutron stars fit onto the Hertzsprung-Russel diagram. The Hertzsprung-Russell diagram is a scatter graph showing the relation between luminosity and the surface temperature of stars. (See Related links - Hertzsprung-Russel diagram) The important sections are the main sequence bang, which are all the stars which are in the process of fusing hydrogen, the giants/supergiants and hypergiants that are fusing helium and the white dwarf…
Enjar Hertzsprung lived in 1873-1967 and Henry Russell lived in 1877-1957. They were scientists who worked separtely. They found the same answer about the temperature and color of stars. The diagram that they made is called the Hertzsprung-Russell diargram. It shows the connection between surface temperature and color. The discoverers of the famous Hertzsprung-Russel diagram (HR diagram), which turned out to be an important tool for the analysis of stars.
Why does the H R diagram constructed from the data on the brightest stars differ so much from the diagram constructed data on the nearest stars?
In the early 20th century, Danish astrophysicist Ejnar Hertzsprung and American astrophysicist Henry Norris Russell independently developed a graph now known as the Hertzsprung-Russell (H-R) diagram, which plots absolute brightness against spectral type. In this diagram, the brightest stars lie near the top of the diagram and the hottest stars lie to the left. On the H-R diagram, most of the stars, including the Sun, fall along a diagonal line that goes from the upper…