Stage 1: On the Main Sequence.
Date: 300 Million BC
Mira's Age: 250 million years
Mira and its larger, brighter companion appear as a pair of
main sequence stars viewed from a hypothetical ringed world orbiting Mira
at a distance of approximately 2.25 AU.Close to the horizon in the foreground, Mira lies squarely on the main sequence. It is a star of type A1-2V, with a mass of 2.8 times that of our Sun. The star's surface temperature is approximately 9800 degrees Kelivn. Mira is expected to spend about 450 to 500 million of its 550 to 600 million year life on the main sequence.
In the background is Mira's companion, a brilliant star of type B8 to A0. Its mass at about 3.2 times solar, this star has a surface temperature of about 10,500 degrees Kelvin, and will evolve to become a white dwarf in approximately 375 million years. Here, it is already 300 million years old and is beginning to run out of hydrogen in its core.
The planet's rings appear edge-on as our point of view is just above the cloud-tops at the planet's equator. The shadows of the rings appear to our right, and, more faintly (Cast by the more distant star) as a faint, dark haziness to our left.
| HR Diagram |
Animated HR Diagram showing the various
stages of Mira's evolution |
| Stellar
Cross Section |
A few drawings of Mira in cross-section
|
| Additional
Information |
Contents change without notice (or may be
completely absent.) |
| Contact information |
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My e-mail. |