| absmag_v = +0.62[11]
}}{{Starbox detail
| source =
| mass = 2.01[12]
| radius = 10[7]
| luminosity = 51[7]
| temperature = {{Val|4966|15|fmt=commas}}[7]
| gravity = {{Val|2.87|0.09}}[16]
| metal_fe = {{Val|+0.09|0.04}}[16]
| rotational_velocity = 2.8[7]
| rotation = 67[19] d
| age_gyr = 2.48[12]
}}{{Starbox catalog
| names = ξ Her, 92 Her, BD+29° 3156, HD 163993, HIP 87933, HR 6703, SAO 85590[21]
}}{{Starbox reference
| Simbad = ksi+Her
}}{{Starbox end}}Xi Herculis is a solitary[22] star located within the northern constellation of Hercules. The star is visible to the naked eye with an apparent visual magnitude of 3.70.[3] Based upon an annual parallax shift of 23.84 mas as seen from Earth, it is located 137 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.05 due to interstellar dust. It is a suspected member of the Sirius stream of co-moving stars.[24]This is an evolved G-type giant star with a stellar classification of G8 III.[4] It is a red clump star, which means it is on the horizontal branch and generating energy through the thermonuclear fusion of hydrogen at its core. The star is emitting X-rays with a luminosity of {{Val|3.03e30|u=erg s−1}} in the 0.3–10 keV band.[19] It has twice[12] the mass of the Sun but, at the age of two and a half billion years,[12] it has expanded to 10[7] times the Sun's radius. The star is radiating 51[7] times the solar luminosity from its photosphere at an effective temperature of 4,966 K.[7]
Chinese name
In R.H.Allen's book, this star, together with ν Her and 99 Her (b Herculis) represent the state of Zhongshan (or Chung Shan' "the Middle Mountain"),[32] but in Chinese literature, that names is applied to ο Her.[1]
References
1. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 6 日
2. ^1 {{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 | date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}
3. ^1 {{citation | first1=R. H. | last1=Allen | page=246 | year=1963 | publisher=Dover | title=Star Names, Their Lore and Meaning | url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Hercules*.html | accessdate=2017-04-11 | postscript=. }}
4. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 }}
5. ^1 2 {{citation | title=The relation between X-ray activity and rotation in intermediate-mass G giants | last1=Gondoin | first1=P. | postscript=. | journal=Astronomy and Astrophysics | volume=444 | issue=2 | pages=531–538 | date=December 2005 | doi=10.1051/0004-6361:20053567 | bibcode=2005A&A...444..531G }}
6. ^1 2 3 4 {{citation | title=Abundances in the Local Region. I. G and K Giants | last1=Luck | first1=R. Earle | journal=The Astronomical Journal | volume=150 | issue=3 | id=88 | pages=23 | date=September 2015 | doi=10.1088/0004-6256/150/3/88 | bibcode=2015AJ....150...88L | arxiv=1507.01466 | postscript=. }}
7. ^1 2 {{citation | display-authors=1 | last1=Prugniel | first1=Ph. | last2=Vauglin | first2=I. | last3=Koleva | first3=M. | title=The atmospheric parameters and spectral interpolator for the MILES stars | journal=Astronomy & Astrophysics | volume=531 | page=A165 | date=July 2011 | doi=10.1051/0004-6361/201116769 | bibcode=2011A&A...531A.165P | postscript=. | arxiv=1104.4952 }}
8. ^1 2 {{citation | last1=Morgan | first1=W. W. | last2=Keenan | first2=P. C. | title=Spectral Classification | journal=Annual Review of Astronomy and Astrophysics | volume=11 | page=29 | year=1973 | postscript=. | doi=10.1146/annurev.aa.11.090173.000333 | bibcode=1973ARA&A..11...29M }}
9. ^1 2 3 4 5 6 7 8 {{citation | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 | date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | display-authors=1 | postscript=. }}
10. ^1 {{citation | title=Ultraviolet Emission Lines in BA and Non-BA Giants | display-authors=1 | last1=Böhm-Vitense | first1=Erika | last2=Carpenter | first2=Kenneth G. | last3=Robinson | first3=Richard D. | journal=The Astrophysical Journal | postscript=. | volume=545 | issue=2 | pages=992–999 | date=December 2000 | doi=10.1086/317850 | bibcode=2000ApJ...545..992B }}
11. ^1 2 3 4 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV data | year=1986 | publisher=SIMBAD | bibcode=1986EgUBV........0M | postscript=. }}
12. ^1 {{cite simbad | title=ksi Her | accessdate=2017-04-08 | postscript=. }}