page_title: HD 108063
section_title: Properties
hierarchical_section_title: HD 108063 / Properties
caption_attribution_description: Hertzsprung–Russell diagram. A plot of luminosity (absolute magnitude) against the colour of the stars ranging from the high-temperature blue-white stars on the left side of the diagram to the low temperature red stars on the right side. "This diagram below is a plot of 22000 stars from the Hipparcos Catalogue together with 1000 low-luminosity stars (red and white dwarfs) from the Gliese Catalogue of Nearby Stars. The ordinary hydrogen-burning dwarf stars like the Sun are found in a band running from top-left to bottom-right called the Main Sequence. Giant stars form their own clump on the upper-right side of the diagram. Above them lie the much rarer bright giants and supergiants. At the lower-left is the band of white dwarfs – these are the dead cores of old stars which have no internal energy source and over billions of years slowly cool down towards the bottom-right of the diagram." Converted to png and compressed with pngcrush.
context_page_description: HD 108063 is a star that lies approximately 176 light-years away in the constellation of Centaurus. The star is not particularly noteworthy with exception to its enormously high heavy element content.
context_section_description: HD 108063 is a somewhat bright star that lies in an area of the southern sky towards the middle of Centaurus. It has not been studied particularly extensively, but was identified as modestly high proper motion star during the previous century. With a Hipparcos parallax of 18.5 mas, it lies at a distance of 54 parsecs, so the star is fairly nearby. The relative brightness of the star at its distance means that it is substantially over-luminous compared to a dwarf star, and as of such it has been previously classified as a G5III or G4IV star. On the Hertzsprung-Russell diagram (left), the star lies on the subgiant branch, confirming that it is over-luminous. The star's B-V colour indicates a spectral type of F9.5, while the spectroscopic effective temperature indicates a spectral type closer to F9.
  Determination of the metallicity of HD 108063 has only been made more recently, with the first value made photometrically in 2004. Their Fe/H of 0.66 dex is slightly higher than the spectroscopic value of Fe/H = 0.55 ± 0.06 dex, which corresponds to a metallicity of 3.54 +0.53
  −0.45 times the solar value. This is one of the highest metallicities for any known star, and is identical to 1σ to the Fe/H of HD 126614 (0.56 ± 0.04 dex) and HD 177830 (0.55 ± 0.03 dex).
  The enormous metallicity of HD 108063 has strong effect on its apparent parameters. A metal-rich star has a cooler surface temperature than a lower-metallicity star, with the strength of the effect increasing with a higher metallicity. On a plot of B-V (which is an indicator of temperature) to absolute magnitude for main sequence stars (left), HD 108063 has the absolute magnitude of an F0V star but the B-V of an F9-G0V (F9.5V) star, again showing that the star is significantly above the main sequence. However, on a plot of stellar mass to absolute magnitude (left), HD 108063 has parameters consistent with an F0V star. This indicates that the over-luminosity is actually an overly low temperature caused by the star's metallicity and that the apparent subgiant luminosity is artificial. HD 108063 is therefore likely to be on the main sequence.
caption: The position of HD 108063 on the Hertzsprung-Russell diagram.
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