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Red clump

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Title: Red clump  
Author: World Heritage Encyclopedia
Language: English
Subject: Star, Red giant, Stellar evolution, Giant star, Hertzsprung–Russell diagram
Collection: Astrophysics, Hertzsprung–russell Classifications, Red Giants, Standard Candles, Stellar Evolution
Publisher: World Heritage Encyclopedia

Red clump

Hertzsprung–Russell diagram showing the evolution of stars of different masses. The red clump is marked RC on the green line showing the evolution of a star of 2 solar masses.

The red clump is a feature in the Hertzsprung–Russell diagram of stars. The red clump is considered the metal-rich counterpart to the horizontal branch. Stars in this part of the Hertzsprung–Russell diagram are sometimes called clump giants. These stars are more luminous than main sequence stars of the same surface temperature (or colder than main sequence stars of comparable luminosity), or above and to the right of the main sequence on the Hertzsprung–Russell diagram. This period in a star's evolution corresponds to the core helium-burning phase, whereas the main sequence is the core hydrogen-burning phase.

In theory, the absolute luminosities of stars in the red clump are fairly independent of stellar composition or age so that consequently they make good standard candles for estimating astronomical distances both within our galaxy and to nearby galaxies and clusters.

An example of a red clump giant is the star Epsilon Tauri.[1]

See also


  1. ^ Sato, Bun'ei; et al. (2007). "A Planetary Companion to the Hyades Giant ε Tauri". The Astrophysical Journal 661 (1): 527–531.  

External links

  • Krzystof Stanek's page on red clumps used for distance measurement
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