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Introduction
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Activities
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Quiz
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Conclusion
Activity 1. How big are the stars?
- Familiarise yourself with the data from the Hertzsprung-Russell diagram presented in the table. You can also work in the Excel spreadsheet provided.
- Compare and order the stars according to their radius – from smallest to largest.
- Next to the name of each star in the list, write the ratio of the stellar radius to the stellar mass (in relative units to solar values, rounded to two decimal places).
- Explain the relationship between radius and mass depending on the type of stars – supergiants, giants, main sequence stars, white dwarfs.
|
Star |
Radius (Solar radii) | Density (Solar Density) |
Mass (Solar mass) |
|
|
Supergiants |
Antares |
776 | 000,000,004 | 20 |
|
Beta Lyra |
192 | 00,014 |
97 |
|
| Betelgeuse | 1 000 | 00,000,005 |
10 |
|
|
Deneb |
96 | 000,002 | 20 | |
| Gama Sadr | 67 | 000,007 |
20 |
|
| Rigel | 78 | 000,004 |
20 |
|
| Giants |
Aldebaran |
|||
|
Arcturus |
35 | 000,018 |
8 |
|
|
Beta Pegasus |
40 | 000,014 |
9 |
|
| Chapel | 13 | 000,096 |
21 |
|
| Main sequence stars |
Our Sun |
10 | 10 |
10 |
|
Altair |
16 | 0,415 | 17 | |
|
Barnard’s Star |
015 | 533 | 018 | |
| 61 A Sadr | 07 | 169 |
058 |
|
|
Hadar |
22 | 00,023 | 25 | |
|
Kruger 60 |
035 | 630 | 027 | |
|
MU-1 Scoprion |
52 | 01,000 |
14 |
|
| Procyon A | 26 | 0,102 |
18 |
|
| Sirius А | 19 | 0,335 |
23 |
|
| White Dwarfs |
40 B Eridani |
0,018 | 71,000 |
041 |
| Sirius B | 0,022 | 90,000 |
099 |
|
| The star of Van Maanen | 0,007 | 47,000 |
014 |
To download: Star data table
