In astronomy, a broad band in the HertzsprungRussell diagram, in which most stars lie. A star spends most of its life on this main sequence, while it burns hydrogen to helium. Once the hydrogen in the core is consumed, the star evolves away from the main sequence, becoming first a red giant. The Sun is a main sequence star.
|
Stellar Class |
Radius | Mass | Luminosity | Temperature |
|---|---|---|---|---|
| R/R☉ | M/M☉ | L/L☉ | K | |
| O2 | 16 | 158 | 2,000,000 | 54,000 |
| O5 | 14 | 58 | 800,000 | 46,000 |
| B0 | 5.7 | 16 | 16,000 | 29,000 |
| B5 | 3.7 | 5.4 | 750 | 15,200 |
| A0 | 2.3 | 2.6 | 63 | 9,600 |
| A5 | 1.8 | 1.9 | 24 | 8,700 |
| F0 | 1.5 | 1.6 | 9.0 | 7,200 |
| F5 | 1.2 | 1.35 | 4.0 | 6,400 |
| G0 | 1.05 | 1.08 | 1.45 | 6,000 |
| G2 | 1.0 | 1.0 | 1.0 | 5,700 |
| G5 | 0.98 | 0.95 | 0.70 | 5,500 |
| K0 | 0.89 | 0.83 | 0.36 | 5,150 |
| K5 | 0.75 | 0.62 | 0.18 | 4,450 |
| M0 | 0.64 | 0.47 | 0.075 | 3,850 |
| M5 | 0.36 | 0.25 | 0.013 | 3,200 |
| M8 | 0.15 | 0.10 | 0.0008 | 2,500 |
| M9.5 | 0.10 | 0.08 | 0.0001 | 1,900 |
"Oh Be A Fine Girl, Kiss Me" is a phrase used to aid memory of the sequence.
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