Sadr
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Sadr (Gamma Cygni, γ Cyg)
The third brightest star in Cygnus and the center star of the Northern Cross; it lies at the northern end of the Great Rift with a spectacular portion of the Milky Way as a backdrop; its name comes from an Arabic phrase meaning “the hen's breast.” Unlike most supergiants, which are either fairly hot or quite cool and reddish, Sadr is yellow-white and of moderate range temperature. It has left the main sequence and is now near a region of temperature and luminosity in which stars become unstable and pulsate.
The third brightest star in Cygnus and the center star of the Northern Cross; it lies at the northern end of the Great Rift with a spectacular portion of the Milky Way as a backdrop; its name comes from an Arabic phrase meaning “the hen's breast.” Unlike most supergiants, which are either fairly hot or quite cool and reddish, Sadr is yellow-white and of moderate range temperature. It has left the main sequence and is now near a region of temperature and luminosity in which stars become unstable and pulsate.
| Visual magnitude: | 2.23 |
| Absolute magnitude: | −6.12 |
| Spectral type: | F8Ib |
| Surface temperature: | 6,500 K |
| Luminosity: | 65,000 Lsun |
| Mass: | 12 Msun |
| Distance: | 1,520 light-years |
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Wiley Book of Astronomy
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