{{Short description|Binary star in the constellation Hercules}}
{{Starbox begin}} {{Starbox image | image = {{Location mark |image=Hercules constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=113 Herculis |x=82|y=682 }} | caption = Location of 113 Herculis (circled in red) }} {{Starbox observe | epoch = J2000.0 | constell = Hercules<ref name=xhip/> | ra = {{RA|18|54|44.88499}}<ref name=GaiaDR3/> | dec = {{DEC|+22|38|42.2715}}<ref name=GaiaDR3/> | appmag_v = 4.57<ref name=xhip/> }} {{Starbox character | component1 = Giant | type = Red clump<ref name=Eggleton2017/> | class = G8III+<ref name=xhip/> | variable = | component2 = Main sequence | type2 = Main Sequence<ref name=Eggleton2017/> | class2 = A0.5<ref name=xhip/> | variable2 = }} {{Starbox astrometry | radial_v = {{val|-21.94|1.84}}<ref name=GaiaDR3/> | total_v = | prop_mo_ra = +6.571 | prop_mo_dec = +1.305 | pm_footnote = <ref name=GaiaDR3/> | parallax = 7.5501 | p_error = 0.2067 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = −1.23<ref name=xhip/> }} {{Starbox orbit | reference = <ref name=Hummel1995/><ref name=Eggleton2017/> | period_unitless = {{val|245.325|0.006}} days | axis = {{val|0.0101|0.0001}} | eccentricity = {{val|0.101|0.005}} | inclination = {{val|40.2|0.6}} | node = {{val|70.1|1.2}} | periastron = {{val|2447784.1|0.8|ul=JD}} | periarg = {{val|186.7|2.0}} | k1 = {{val|15.48|0.09}} | k2 = {{val|22.58|0.30}} }} {{Starbox detail | source = <ref name=Eggleton2017/> | component1 = A | mass = 3.045 | radius = 22.2 | luminosity = | gravity = | temperature = 5047 | metal_fe = | rotation = | rotational_velocity = | age_myr = 390.9 | component2 = B | mass2 = 2.087 | radius2 = 2.05 | temperature2 = 9506 | age_myr2 = 390.9 }} {{Starbox catalog | names = {{odlist | F=113 Her | ADS=11820 | BD=+22 3524 | GC=25954 | HD=175492, HD 175493 | HIP=92818 | HR=7133 | IRAS=18526+2234 | PPM=108046 | SAO=86567 | TYC=2109-2837-1}}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = *+113+Her }} {{Starbox end}}
'''113 Herculis''' is a binary star system located about {{convert|430|ly|pc|lk=on|abbr=off}} away in the constellation Hercules. With an apparent magnitude of 4.6, it is faintly visible to the naked eye.<ref>{{Cite web |last=Ford |first=Dominic |title=113-Her (Star) |url=https://in-the-sky.org//data/object.php?id=TYC2109-2837-1 |access-date=2025-10-31 |website=In-The-Sky.org }}</ref>
This star was first discovered to be a spectroscopic binary in 1900 by W. W. Campbell and W. H. Wright.<ref name=Campbell1900/> The two stars orbit with a period of 245.3 days.<ref name=Hummel1995/>
==Charecterstics== 113 Herculis is a spectroscopic double-line binary with an orbital period of 245.33 days and an eccentricity of 0.10. The system is estimated to be 391 million years old. It contains an evolved primary star, designated 113 Herculis Aa, and generally classified as a G-type yellow giant. It is a red clump star , meaning that it generates its energy by the fusion of helium in its core. It is estimated to be 3.15 times more massive than the Sun and its radius is nearly 24 times larger than the Sun's radius. Its surface temperature is {{val|fmt=commas|4,775|ul=K}}. The Secondary component, 113 Herculis Ab, is a white main-sequence star of type A0 to A8. It is 2.18 times more massive than the Sun and its radius is 2.1 times larger than the solar radius. Its surface temperature is 9,183 K.<ref name=Eggleton2017/><ref>{{Cite journal |last=Skiff |first=B. A. |date=October 2014 |title=VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- ) |journal=VizieR Online Data Catalog |volume=1 |pages=B/mk |bibcode=2014yCat....1.2023S }}</ref>
Double and multiple star catalogs list two visual companions of magnitude 11.1 near 113 Herculis. Designated B and C, they were located at 34.4 and {{val|36.9|ul=arcseconds}} respectively from 113 Herculis A in 2001.<ref name=wds>{{Cite journal |last1=Mason |first1=Brian D. |last2=Wycoff |first2=Gary L. |last3=Hartkopf |first3=William I. |last4=Douglass |first4=Geoffrey G. |last5=Worley |first5=Charles E. |date=December 2001 |title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog |journal=The Astronomical Journal |volume=122 |issue=6 |pages=3466–3471 |doi=10.1086/323920 |bibcode=2001AJ....122.3466M }}</ref> Eggleton & Tokovinin (2008) proposed that these two stars are physically bound to the system,<ref name=eggleton2008>{{Cite journal |last1=Eggleton |first1=P. P. |last2=Tokovinin |first2=A. A. |date=2008-09-11 |title=A catalogue of multiplicity among bright stellar systems |journal=Monthly Notices of the Royal Astronomical Society |volume=389 |issue=2 |pages=869–879 |doi=10.1111/j.1365-2966.2008.13596.x |arxiv=0806.2878 |bibcode=2008MNRAS.389..869E |doi-access=free }}</ref> but measurements of their annual parallaxes of components B and C by the Gaia satellite show that they are much more distant, at distances of about {{convert|590|pc|ly}}<ref name=GaiaDR3b/> and about {{convert|4|kpc|kly}}<ref name=GaiaDR3c/> respectively.
==References== {{Reflist|refs=
<ref name=SIMBAD>{{cite simbad |title=* 113 Her |access-date=2 August 2025}}</ref>
<ref name=GaiaDR3>{{Cite Gaia DR3|4532952022299038976}}</ref>
<ref name=GaiaDR3b>{{Cite Gaia DR3|4532952121073147264}}</ref>
<ref name=GaiaDR3c>{{Cite Gaia DR3|4532963872103668864}}</ref>
<ref name=xhip>{{Cite XHIP|92818}}</ref>
<ref name=Campbell1900>{{cite journal |last1=Campbell |first1=W. W. |last2=Wright |first2=W. H. |date=November 1900 |title=A list of nine stars whose velocities in the line of sight are variable. |journal=Astrophysical Journal |volume=12 |issue= |pages=254–257 |doi=10.1086/140765 |bibcode=1900ApJ....12..254C}}</ref>
<!-- <ref name=Wilson1913>{{cite journal |last1=Wilson |first1=R. E. |date=1913 |title=The orbit of the spectroscopic binary 113 Herculis. |journal=Lick Observatory Bulletin |volume=7 |issue= |pages=106-107 |bibcode=1913LicOB...7..106W}}</ref> -->
<ref name=Hummel1995>{{cite journal |last1=Hummel |first1=C. A. |last2=Armstrong |first2=J. T. |display-authors=etal |date=July 1995 |title=Orbits of Small Angular Scale Binaries Resolved with the Mark III Interferometer |journal=Astronomical Journal |volume=110 |issue= |page=376 |doi=10.1086/117528 |bibcode=1995AJ....110..376H}}</ref>
<ref name=Eggleton2017>{{cite journal |last1=Eggleton |first1=Peter P. |last2=Yakut |first2=Kadri |date=July 2017 |title=Models for 60 double-lined binaries containing giants |journal=Monthly Notices of the Royal Astronomical Society |volume=468 |issue=3 |pages=3533–3556 |doi=10.1093/mnras/stx598 |doi-access=free |arxiv=1611.05041 |bibcode=2017MNRAS.468.3533E}}</ref>
}}
{{Hercules (constellation)}}
Category:Hercules (constellation) Category:Spectroscopic binaries Category:G-type giants Category:A-type main-sequence stars Herculis, 113 7133 BD+22 3524 175492 3 092818