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The Open Source Physics Project is supported by NSF DUE-0442581.

Computer Program Detail Page

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Hertzsprung–Russell (H-R) Diagrams
written by Mario Belloni
The Hertzsprung–Russell (H-R) Diagrams model simulates Hertzsprung–Russell (HR or H-R) diagram for groups of stars. The diagram is a scatter plot of steller luminosity vs. stellar temperature. The luminosity of stars is proportional to the star's radius squared and its temperature to the fourth power, and for Main Sequence stars, their luminosity is also proportional to their mass to the 3.5 power. Since the range of stellar luminosities and stellar temperatures is so large, the plot uses a log-log scale. The diagram is a way to understand stellar evolution.

The HR diagram shows nearby stars, bright stars, and a user-defined star. One can also show the blackbody radiation curve and the user-defined star. The radius of the user-defined star (in Rsun) and the temperature of the user-defined star in Kelvin (5780 K is Tsun) can be changed.

Please note that this resource requires at least version 1.5 of Java (JRE).

Please note that this resource requires Java3D.
1 source code document is available
Subjects Levels Resource Types
- Astronomy Education
= Curricula
- Stars
= Hertzsprung-Russell Diagram
= Spectral Types
- Photometry
= Blackbodies
- Lower Undergraduate
- High School
- Informal Education
- Instructional Material
= Curriculum support
= Demonstration
= Simulation
Intended Users Formats Ratings
- Educators
- Learners
- application/java
  • Currently 5.0/5

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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Mario Belloni
EJS, Easy Java Simulations, H-R Diagram, OSP, Open Source Physics, blackbody, spectrum, star
Record Cloner:
Metadata instance created November 11, 2010 by Mario Belloni
Record Updated:
December 2, 2021 by Lyle Barbato
Last Update
when Cataloged:
November 11, 2010
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
M. Belloni, Computer Program HERTZSPRUNG–RUSSELL (H-R) DIAGRAMS, Version 1.0 (2010), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959).
M. Belloni, Computer Program HERTZSPRUNG–RUSSELL (H-R) DIAGRAMS, Version 1.0 (2010), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959>.
APA Format
Belloni, M. (2010). Hertzsprung–Russell (H-R) Diagrams (Version 1.0) [Computer software]. Retrieved June 12, 2024, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959
Chicago Format
Belloni, Mario. "Hertzsprung–Russell (H-R) Diagrams." Version 1.0. https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959 (accessed 12 June 2024).
MLA Format
Belloni, Mario. Hertzsprung–Russell (H-R) Diagrams. Vers. 1.0. Computer software. 2010. Java (JRE) 1.5, Java3D. 12 June 2024 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959>.
BibTeX Export Format
@misc{ Author = "Mario Belloni", Title = {Hertzsprung–Russell (H-R) Diagrams}, Month = {November}, Year = {2010} }
Refer Export Format

%A Mario Belloni %T Hertzsprung–Russell (H-R) Diagrams %D November 11, 2010 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959 %O 1.0 %O application/java

EndNote Export Format

%0 Computer Program %A Belloni, Mario %D November 11, 2010 %T Hertzsprung–Russell (H-R) Diagrams %7 1.0 %8 November 11, 2010 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10503&DocID=1959

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Hertzsprung–Russell (H-R) Diagrams:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Hertzsprung–Russell (H-R) Diagrams.

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