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How to understand Stellar Evolution

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How to understand Stellar Evolution
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cacella
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Joined: 07 Jan 2006
Posts: 518
Location: Brazil

PostPosted: Tue Oct 31, 2006 6:40 am    Post subject: How to understand Stellar Evolution Reply with quote
 
Hi guys,

One of the interesting things available in Tachyon is the HR (Hertzprung-Russell) diagram. In SkyCharts you can press the top right "M" button to have a legend visible. This legend shows you not only the magnitude scale, but also a spectral scale.
This Spectral scale is the color or a Star. A Star's color is caused by its external body tempetature ( http://en.wikipedia.org/wiki/Blackbody_radiation ). Some time ago, in the last century, astronomers made a relationship between absolute magnitude ( http://en.wikipedia.org/wiki/Absolute_magnitude ) and external temperatures of stars and observed that existed a pattern.
This pattern is the HR diagram (http://en.wikipedia.org/wiki/Hr_diagram ). Using Tachyon you can plot any star location in HR diagram and verify its evolutionary stage. To do so context menu over any star and make a choice of "Info on an ob ject". You will have object data and a button called HR Diagram in left bottom of the screen. Pressing it and Tachyon will plot a red ball indicating Star position in diagram. The Sun is a red cross in the middle as it is in a half-age stage of evolution.

Have fun

Regards,


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