A diagram in which the luminosities of stars are plotted against their colours or spectral types. In the conventional way in which this diagram is plotted, luminosity increases logarithmically up the vertical axis and temperature increases from right to left along the horizontal axis. Stars do not occupy all regions of the H-R diagram but form various sequences, the most important being the main sequence, the giant branch and the horizontal branch.
Plotted positions of the stars according to their absolute magnitudes or luminosities on a vertical scale against their spectral class or temperature or color index or a horizontal scale.
is a two-dimensional field of stars where luminosity (total radiation emitted) is the ordinate (dependent variable) and color (surface temperature) is the abscissa (determinant variable). This diagram is used extensively in astronomy to infer properties of stars whose distance makes direct measurement difficult or impossible. In terms of the HR diagram, evolved stars are either overluminous or underluminous for their color, that is, they are above or below the main sequence (q. v.) of the stars.
Plot of stellar luminosity (or absolute magnitude) against effective temperature (or color), in which the evolution of stars of different masses may be followed.
A two-dimensional graph of stellar brightness versus surface temperature. The diagram reveals a number of distinct groupings of stars, the most prominent of which is the main sequence. Others are the supergiants, red giants, and white dwarfs.
A diagram which plots temperature (or color) vs. luminosity for a population of stars. more
plot of M (or, for stellar clusters, m) against spectral class. Several equivalent forms exist, e.g. log L vs log T and M vs B-V (colour-magnitude diagram).
A plot of stellar magnitudes against spectral types.
a diagram that plots luminosity against temperature for a group of stars
A graph plotting absolute magnitude against spectral type. Shows the correspondence between temperature and luminosity.
a plot of stellar luminosity vs. temperature invented by two astronomers, Hertzsprung and Russell. High temperatures are on the left side and decrease to the right. Low luminosities are on the bottom and increase vertically.
A plot of luminosity against surface temperature (or spectral type) for a group of stars.
The Hertzsprung -Russell (H-R) Diagram is a graph that plots stars color (spectral type or surface temperature) vs. its luminosity (intrinsic brightness or absolute magnitude). On it, astronomers plot stars' color, temperature, luminosity, spectral type, and evolutionary stage. This diagram shows that there are 3 very different types of stars: Most stars, including the sun, are "main sequence stars," fueled by nuclear fusion converting hydrogen into helium. For these stars, the hotter they are, the brighter. Giants and Supergiants are above the main sequence. Faint white dwarfs (hot, dim stars) are below the main sequence stars.
The Hertzsprung-Russell diagram (usually referred to by the abbreviation H-R diagram or HRD, also known as a Colour-Magnitude diagram, or CMD) shows the relationship between absolute magnitude, luminosity, classification, and effective temperature of stars. The diagram was created circa 1910 by Ejnar Hertzsprung and Henry Norris Russell, and represented a huge leap forward in understanding stellar evolution, or the 'lives of stars'.