Nebulae themselves are not directly plotted on the Hertzsprung-Russell (HR) diagram, which is a graphical representation of stars based on their luminosity and temperature. However, nebulae are often the regions where stars form, and the stars that emerge from these nebulae can be represented on the HR diagram. The HR diagram primarily focuses on the evolutionary stages of individual stars rather than the nebulae from which they originate.
its located somewhere
They are very hot stars.
Alpha Pavonis, also known as Peacock, is a blue-white star located in the HR diagram's area corresponding to hot and luminous stars, specifically in the upper left region where blue supergiants are located.
Of course they are on the HR diagram. They are simply not on the main sequence.
The HR diagram contains only stars - so everywhere.
nebula
The Sun is classified as a G-type main-sequence star (G dwarf) on the Hertzsprung-Russell (HR) diagram. It has a surface temperature of about 5,500 degrees Celsius and an absolute magnitude of approximately +4.83. On the HR diagram, the Sun is located in the middle of the main sequence, where it occupies a position indicative of its mass and luminosity relative to other stars.
On the HR diagram, the coolest stars are located on the right side, specifically in the red dwarf region of the main sequence. These stars have low temperatures, typically ranging from about 2,500 to 3,500 Kelvin. Additionally, some cooler stars can be found in the red giant area, which is located above the main sequence on the right side.
The Helix Nebula is a planetary nebula located in the constellation Aquarius, while the Ring Nebula is a planetary nebula located in the constellation Lyra. The Helix Nebula appears more like a disk or helix shape, while the Ring Nebula appears as a ring or donut shape due to its orientation.
The majority of stars in a Hertzsprung-Russell (HR) diagram are located along the main sequence, which runs diagonally from the upper left (hot, luminous stars) to the lower right (cool, dim stars). This area contains about 90% of all stars, including our Sun. Stars on the main sequence are in a stable phase of hydrogen fusion in their cores. Other regions of the HR diagram, such as the giant and white dwarf areas, contain significantly fewer stars.
HR diagram
The red dwarves.