98 Herculis
{{Short description|Aging red giant star in the constellation Hercules}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Hercules
| dec = {{DEC|+22|13|07.9396}}
}}
{{Starbox character
| type =AGB
| class = M3-SIII or M3IIIBa0.2
| u-b =
}}
{{Starbox astrometry
| radial_v = {{Val|−19.48|0.21}}
| parallax = 5.5201
| p_error = 0.1610
}}
{{Starbox detail
| source =
| mass =
| radius = {{Val|85.39|10.72|8.50}}
| temperature = {{Val|3772|203|217|fmt=commas}}
| luminosity = {{Val|1329.7|44.7|fmt=commas}}
| gravity =
| metal_fe =
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names={{odlist | F=98 Her | BD=+22°3273 | HD=165625 | HIP=88657 | HR=6765 | SAO=85725 | NSV=10208 }}
}}
{{Starbox reference
| Simbad=98+Her
}}
{{Starbox end}}
98 Herculis is a single star located approximately 590 light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude of 4.96. The brightness of the star is diminished by an extinction of 0.19 due to interstellar dust. The star is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.
This is an aging red giant star on the asymptotic giant branch with a stellar classification of M3-SIII, where the suffix notation indicating this is an S-type star. It is a mild barium star with an intensity class of 0.2, and is a suspected variable star, although Percy and Shepherd (1992) were unable to confirm this. With the hydrogen at its core exhausted, the star has expanded to around 85 times the Sun's radius. It is radiating 1,330 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,772 K.
References
{{reflist|refs=
{{cite simbad | title=98 Her | access-date=2019-06-17 }}
{{Cite Gaia DR2|4576646442579101440}}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | postscript=.
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| title=The Perkins catalog of revised MK types for the cooler stars
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| journal=Astrophysical Journal Supplement Series
| volume=71 | pages=245 | year=1989 | postscript=.
| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
| 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 | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| 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 | s2cid=17804304 | postscript=. }}
| display-authors=1 | last1=Gomez | first1=A. E.
| last2=Luri | first2=X. | last3=Grenier | first3=S.
| last4=Prevot | first4=L. | last5=Mennessier | first5=M. O.
| last6=Figueras | first6=F. | last7=Torra | first7=J.
| title=Absolute magnitudes and kinematics of barium stars
| journal=Astronomy and Astrophysics
| volume=319 | pages=881 | year=1997
| bibcode=1997A&A...319..881G | postscript=. }}
| last1=Eggen | first1=Olin J.
| title=Asymptotic giant branch stars near the sun
| journal=Astronomical Journal | postscript=.
| volume=104 | issue=1 | date=July 1992 | pages=275–313
| doi=10.1086/116239 | bibcode=1992AJ....104..275E }}
| title=A Photometric Survey of Small-Amplitude Red Variables
| last1=Percy | first1=J. R. | last2=Shepherd | first2=C. W.
| journal=Information Bulletin on Variable Stars
| volume=3792 | page=1 | date=October 1992
| bibcode=1992IBVS.3792....1P | postscript=. }}
| last1=Lu | first1=Phillip K.
| title=Taxonomy of barium stars
| journal=Astronomical Journal | postscript=.
| volume=101 | pages=2229 | year=1991
| bibcode=1991AJ....101.2229L | doi=10.1086/115845 | doi-access=free }}
}}
{{Stars of Hercules}}
{{DEFAULTSORT:98 Herculis}}
Category:Hercules (constellation)