Editing Sigma Draconis System
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The traditional name ''Alsaf'' (also Athafi) supposedly derives from an Arabic word al-athafi "the cooking tripods". This refers to the tripods used by nomads for open-air cooking. | The traditional name ''Alsaf'' (also Athafi) supposedly derives from an Arabic word al-athafi "the cooking tripods". This refers to the tripods used by nomads for open-air cooking. | ||
The star is a main sequence dwarf of [[Spectral (Stellar) Classification System|Spectral Class | The star is a main sequence dwarf of [[Spectral (Stellar) Classification System|Spectral Class K White Dwarf Star (K0V)]]. The radius of this star has been directly measured, which yields a result of 77.8% of the Sol's radius. The rotation rate of this star (''v''sin''i'') is relatively low at 1.5 km/s. It is considered a slightly metal-poor star; meaning it has a lower proportion of isotopes with more mass than Helium when compared to [[Sol]]. | ||
The temperature, luminosity and surface activity of this star appear to vary slightly in a manner very similar to the sunspot cycle, although the full length of this cycle has not yet been determined. The total variability of this star is among the lowest of all stars that have been measured by the Hipparcos project. | The temperature, luminosity and surface activity of this star appear to vary slightly in a manner very similar to the sunspot cycle, although the full length of this cycle has not yet been determined. The total variability of this star is among the lowest of all stars that have been measured by the Hipparcos project. |