HRCalc is a scientific calculator that you can use to derive properties of stars given a star's luminosity and surface temperature.
With these values, HRCalc can derive the radius of a star and display stellar size relationships using graphical models.
HRCalc allows you to experiment with various luminosity and temperature settings to determine the effects of these parameters on a star's theoretical size.
In addition to that, HRCalc will enable you to plot stars on a Hertzsprung-Russell (H-R) Diagram, which is an important tool used in Astronomical Sciences to compare different types of stars.
Plots generated with HR Calc can be saved as XML files and reloaded at a later time. HRCalc comes with a database containing thousands of stars which can be modeled in the interface and plotted.
HRCalc is designed for astronomy educators, students and enthusiasts to help them understand the relationship between stellar temperatures, luminosities and sizes, and where these stars fall on the H-R Diagram.
HRCalc is also useful in the classroom, allowing instructors to integrate this tool into their astronomy courses as a hands-on learning or demonstration tool.
NOTE: To download HRCalc via the App Store, an Apple account is required.
What's New in This Release: [ read full changelog ]
· Added "Habitable Zone" visual model for Main Sequence stars.
· "Color Index" values are now calculated and displayed in the Stellar Properties dialog if the data contains a B magnitude for the star.