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The 39 pages that link to Hertzsprung–Russell diagram, each with the reason it gives.

• Stellar classificationRelated: It displays how spectral temperature categories relate to stellar luminosity.

• Main sequenceNarrower topic: The main sequence is the diagram’s defining diagonal band.

• Red giantNarrower topic: It shows red giants as luminous stars with relatively cool surfaces.

• Absolute magnitudeRelated: Absolute magnitude places stars vertically on widely used versions of this diagram.

• Stellar luminosityRelated: It displays how luminosity tracks stellar temperature and evolutionary state.

• Stellar massRelated: Massive and low-mass stars occupy characteristic regions during their evolution.

• Annie Jump CannonRelated: Cannon’s spectral classifications later helped astronomers organize stars by temperature and luminosity.

• Color–magnitude diagramNarrower topic: The color–magnitude diagram is its observational counterpart, using brightness and color.

• Stellar radiusRelated: Radius helps explain why stars occupy different regions of the diagram.

• Horizontal branchNarrower topic: The horizontal branch is identified by its position on this diagram.

• Period–luminosity relationRelated: It displays the instability strip and the luminosity range occupied by pulsating stars.

• Solar luminosityRelated: The Sun’s luminosity locates it on this central map of stellar properties.

• Stellar ageRelated: A star’s location on this diagram helps identify its evolutionary stage.

• StarRelated: It organizes stars by observable properties and exposes their evolutionary patterns.

• Spectral typeRelated: Spectral types form the temperature axis used to map stellar populations and evolution.

• PleiadesRelated: Its color–magnitude sequence helps astronomers estimate the Pleiades’ age and distance.

• Spectral classificationRelated: Spectral types provide one axis and reveal the main sequence and giant branches.

• Yerkes ObservatoryRelated: Yerkes observations contributed to the stellar measurements used to interpret this diagram.

• Pre-main-sequence starNarrower topic: Pre-main-sequence contraction appears as a distinct track on this map of stellar properties.

• Bolometric luminosityRelated: Bolometric luminosity supplies the vertical coordinate for stars with broad spectral coverage.

• Henry Norris RussellCompared with: Hertzsprung’s independent development distinguishes the diagram’s shared origins from Russell’s individual contributions.

• Classical Cepheid variableRelated: It shows where Cepheids lie relative to the instability strip and stellar evolution tracks.

• Instability stripNarrower topic: The instability strip is located by temperature and luminosity on this diagram.

• Red-giant branchNarrower topic: The red-giant branch is defined by its position on this diagram.

• SubgiantRelated: Subgiants occupy the region between the main sequence and red-giant branch.

• Type II CepheidRelated: It locates Type II Cepheids among evolved stars crossing the instability strip.

• Ejnar HertzsprungRelated: Hertzsprung independently developed the diagram that bears his name alongside Henry Norris Russell.

• Hayashi trackNarrower topic: The Hayashi track is defined as a path on this stellar diagram.

• Giant starRelated: The giant branch separates stars that share temperatures but differ greatly in luminosity.

• Stellar astronomyRelated: It organizes observed stars into groups that expose evolutionary stages and physical differences.

• SupergiantRelated: It places supergiants in the luminous regions above the main sequence and giant branch.

• Allan SandageRelated: The cluster stars’ positions on this diagram let Sandage compare observations with stellar-evolution models.

• Herbig Ae/Be starRelated: Their positions on this diagram reveal their pre-main-sequence status.

• Visible-light astronomyRelated: Visible magnitudes and colors place stars on a diagram that tracks stellar evolution.

• HypergiantRelated: It locates hypergiants among the most luminous regions of stellar populations.

• Messier 22Related: Its stellar sequence reveals the ages and evolution of cluster stars.

• SubdwarfRelated: It places subdwarfs below the main sequence at comparable temperatures.

• Messier 4Related: Its cluster-wide pattern reveals stellar ages and evolutionary stages.

• Yellow supergiantRelated: Yellow supergiants occupy a luminous region between hot and cool supergiants.