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- Horizontal_branch abstract "The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's. The helium core flash that occurs to stars at the top of the red giant branch causes substantial changes in stellar structure, resulting in an overall reduction in luminosity, some contraction of the stellar envelope, and surfaces reaching higher temperatures. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion in a shell surrounding the core.Horizontal branches were discovered with the first deep photographic photometric studies of globular clustersand were notable for being absent from all open clusters that had been studied up to that time. The horizontal branch is so named because in low-metallicity samples like globular clusters, HB stars lie along a roughly horizontal line in a Hertzsprung–Russell diagram (CMD).".
- Horizontal_branch thumbnail M3_color_magnitude_diagram.jpg?width=300.
- Horizontal_branch wikiPageID "793975".
- Horizontal_branch wikiPageRevisionID "605990494".
- Horizontal_branch hasPhotoCollection Horizontal_branch.
- Horizontal_branch subject Category:Hertzsprung–Russell_classifications.
- Horizontal_branch subject Category:Horizontal-branch_stars.
- Horizontal_branch type Abstraction100002137.
- Horizontal_branch type Act100030358.
- Horizontal_branch type Activity100407535.
- Horizontal_branch type Categorization101012712.
- Horizontal_branch type Event100029378.
- Horizontal_branch type Grouping101012360.
- Horizontal_branch type Hertzsprung-RussellClassifications.
- Horizontal_branch type PsychologicalFeature100023100.
- Horizontal_branch type YagoPermanentlyLocatedEntity.
- Horizontal_branch comment "The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's. The helium core flash that occurs to stars at the top of the red giant branch causes substantial changes in stellar structure, resulting in an overall reduction in luminosity, some contraction of the stellar envelope, and surfaces reaching higher temperatures.".
- Horizontal_branch label "Branche horizontale".
- Horizontal_branch label "Horizontal branch".
- Horizontal_branch label "Horizontalast".
- Horizontal_branch label "Rama horizontal".
- Horizontal_branch label "Ramo horizontal".
- Horizontal_branch label "Ramo orizzontale".
- Horizontal_branch label "Горизонтальная ветвь".
- Horizontal_branch label "水平分支".
- Horizontal_branch label "水平分枝".
- Horizontal_branch sameAs Horizontalast.
- Horizontal_branch sameAs Rama_horizontal.
- Horizontal_branch sameAs Branche_horizontale.
- Horizontal_branch sameAs Ramo_orizzontale.
- Horizontal_branch sameAs 水平分枝.
- Horizontal_branch sameAs 수평가지.
- Horizontal_branch sameAs Ramo_horizontal.
- Horizontal_branch sameAs m.03ckjk.
- Horizontal_branch sameAs Q50076.
- Horizontal_branch sameAs Q50076.
- Horizontal_branch sameAs Horizontal_branch.
- Horizontal_branch wasDerivedFrom Horizontal_branch?oldid=605990494.
- Horizontal_branch depiction M3_color_magnitude_diagram.jpg.
- Horizontal_branch isPrimaryTopicOf Horizontal_branch.
