en>Mdd: Wikification

2013-04-17T23:48:17Z

Wikification

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{{more footnotes|date=July 2013}}

{{Starbox begin
| name = HD 108063
}}
{{Starbox image
| image = [[File:HD108063ESO.png|250px]]
| caption = HD 108063.
| credit = [[European Southern Observatory|ESO]]
}}
{{Starbox observe
| epoch = J2000.0
| constell = [[Centaurus]]
| ra = {{RA|12|25|08.52}} ± 2.37<ref name="van Leeuwen2007"/>
| dec = {{DEC|-42|30|51.53}} ± 2.11<ref name="van Leeuwen2007"/>
| appmag_v = 6.2357 ± 0.006<ref name="van Leeuwen2007"/>
}}
{{Starbox character
| class = F9.5IV<ref name="Teff"/><ref name="HR"/><ref group="note">Despite the luminosity class of IV indicating a subgiant, the star likely still on the main sequence; see text.</ref>
| b-v = 0.652 ± 0.002<ref name="van Leeuwen2007"/><ref group="note">Reddening = 0.077 (Casagrande et al. 2011)</ref><ref name="Casagrande2011"/>
}}
{{Starbox astrometry
| radial_v = 34.48 ± 0.16<ref name="DeMedeiros1999"/>
| prop_mo_ra = -135.25 ± 0.27<ref name="van Leeuwen2007"/>
| prop_mo_dec = -22.55 ± 0.24<ref name="van Leeuwen2007"/>
| parallax = 18.53
| p_error = 0.37
| parallax_footnote = <ref name="van Leeuwen2007"/>
| absmag_v = 2.58 ± 0.05<ref name="AbsMag"/>
}}
{{Starbox detail
| mass = 1.580 ± 0.034<ref name="Sousa2011"/>
| metal_fe = 0.55 ± 0.06<ref name="Sousa2011"/>
| radius =
| luminosity = 8.47 ± 0.34 (log 0.9279 ± 0.0173)<ref name="Sousa2011"/>
| temperature = 6081 ± 49<ref name="Sousa2011"/>
| gravity = 4.11 ± 0.12<ref name="Sousa2011"/>
| rotational_velocity = 5.4 ± 1.0<ref name="DeMedeiros1999"/>
| rotation =
| age_gyr =
}}
{{Starbox catalog
| names = HIP 60591, HR 4721
}}
{{Starbox reference
| Simbad = HD+108063
}}
{{Starbox end}}

'''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.

==Properties==
<div style="position: relative">[[File:HRDiagram.png|thumb|left|The position of HD 108063 on the [[Hertzsprung-Russell diagram]].]]
<div style="position: absolute; left: 80px; top: 108px">[[File:Chess tile xg.svg|20px]]</div>
</div>
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.<ref name="Teff"/>

Determination of the metallicity of HD 108063 has only been made more recently, with the first value made photometrically in 2004.<ref name="Nordstrom2004"/> Their Fe/H of 0.66 dex is slightly higher than the spectroscopic value of Fe/H = 0.55 ± 0.06 dex,<ref name="Sousa2011"/> 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).

[[File:HD108063AbsMagBVMs.png|thumb|left|The position of HD 108063 (red) on plots of (top) B-V - absolute magnitude, and (bottom) mass - absolute magnitude for main sequence stars using data from <ref name="Teff"/>]]
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.

== Notes ==
{{Reflist|group=note}}

==References==
{{reflist|refs

<ref name="van Leeuwen2007">{{cite journal | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}</ref>

<ref name="Teff">[http://www.pas.rochester.edu/~emamajek/EEM_dwarf_UBVIJHK_colors_Teff.dat A Modern Mean Stellar Color and Effective Temperatures (Teff) # Sequence for O9V-Y0V Dwarf Stars], E. Mamajek, 2011, website/downloadable file. Used for temperatures and B-V values for different spectral types to find the spectral type listed here, and for metallicity-affected parameters if HD 108063 had a solar metallicity.</ref>

<ref name="HR">Luminosity class from position on Hertzsprung-Russell diagram (see image).</ref>

<ref name="Casagrande2011">{{cite journal | title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey | last1=Casagrande | first1=L. | coauthors = ''et al.'' | journal=Astronomy & Astrophysics | year=2011 | arxiv=1103.4651 | bibcode=2011A&A...530A.138C | doi=10.1051/0004-6361/201016276 }}</ref>

<ref name="DeMedeiros1999">{{cite journal | title=A catalog of rotational and radial velocities for evolved stars | last1=De Medeiros | first1=J. R. | last2=Mayor | first2=M. | year=1999 | bibcode=1999A%26AS..139..433D | doi=10.1051/aas:1999401 }}</ref>

<ref name="AbsMag">The relevant calculation for absolute magnitude is <math> M = m - 5 ((\log_{10}{D_L}) - 1)\!\,</math>, where <math>m\!\,</math> is the apparent magnitude and <math>D_L\!\,</math> is the distance in light-years. The large error compared to the error on observed magnitude is due to the substantial error in distance.</ref>

<ref name="Sousa2011">{{cite journal | title=Spectroscopic stellar parameters for 582 FGK stars in the HARPS volume-limited sample. Revising the metallicity-planet correlation | last1=Sousa | first1=S. G. | coauthors = ''et al.'' | year=2011 | arxiv=1108.5279 | bibcode=2011A&A...533A.141S | doi=10.1051/0004-6361/201117699 }}</ref>

<ref name="Nordstrom2004">{{cite journal | title=The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs | last1=Nordström | first1=B. | coauthors = ''et al.'' | year=2004 | arxiv=astro-ph/0405198 | bibcode=2004A&A...418..989N | doi=10.1051/0004-6361:20035959 }}</ref>

}}

{{Stars of Centaurus}}

[[Category:Henry Draper Catalogue objects|108063]]
[[Category:Hipparcos objects|60591]]
[[Category:HR objects|4721]]
[[Category:Centaurus (constellation)]]
[[Category:F-type subgiants]]

Bernal chart - Revision history

en>Mdd: Wikification