Project AstroFly Examples: Our Sun in the Hertzsprung-Russell Diagram
This image, generated by AstroFly,
shows our Sun's position in the Hertzsprung-Russell diagram, marked by a violet
cross. Any star you see in AstroFly may be displayed in the Hertzsprung-Russell
diagram the same way. The H-R diagram itself displays an interesting correlation
between temperature (B-V color index) and luminosity (absolute magnitude).
The Sun lies in the middle of the diagonal band in the diagram. The band
is called the main sequence where stars spend most of their life time, moving
on it from the upper left to the lower right. The red giant and supergiant
stars are in the upper right of the diagram.
If you use the star database derived from the Tycho Catalogue, you may see
that our neighborhood in our own Milky Way Galaxy is full of old stars that
have exhausted their nuclear fuel; the white dwarfs are visible in the lower
left of the diagram; the red dwarfs, in the lower right.
To get this view in AstroFly,
follow these steps:
- Start AstroFly.
- In the Main Control Panel, uncheck the box Limit Visual
Magnitude (from the Sun).
- Choose Tools > Find Star.
- In the Find Star By dialog box, enter the text SUN into
the Name field, and click the Find It button.
- In the Information about This Marked Star window, click
the Show It in H-R Diagram button.