[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/89-herculis-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki43\/89-herculis-wikipedia\/","headline":"89 Herculis – Wikipedia","name":"89 Herculis – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Star in the constellation Hercules 89 Herculis after-content-x4 Location of 89 Her (circled)","datePublished":"2017-10-18","dateModified":"2017-10-18","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki43\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki43\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/c\/c8\/Hercules_constellation_map.svg\/280px-Hercules_constellation_map.svg.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/c\/c8\/Hercules_constellation_map.svg\/280px-Hercules_constellation_map.svg.png","height":"311","width":"280"},"url":"https:\/\/wiki.edu.vn\/en\/wiki43\/89-herculis-wikipedia\/","wordCount":4144,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Star in the constellation Hercules89 Herculis       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Location of 89 Her (circled)Observation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000ConstellationHerculesRight ascension17h 55m 25.18845s[1]Declination26\u00b0\u00a002\u2032\u00a059.9701\u2033[1]Apparent\u00a0magnitude\u00a0(V)(5.34 – 5.54[2])CharacteristicsEvolutionary\u00a0stagepost-AGBSpectral\u00a0typeF2Ibe[3]U\u2212B color index\u22120.34[4]B\u2212V color index+0.34[4]Variable\u00a0typeSRd[2]AstrometryRadial velocity (Rv)\u221228.5[5]\u00a0km\/sProper motion (\u03bc) RA:\u00a03.894[1]\u00a0mas\/yr Dec.:\u00a05.193[1]\u00a0mas\/yr Parallax (\u03c0)0.6893\u00a0\u00b1\u00a00.0718\u00a0mas[1]Distanceapprox. 4,700\u00a0ly (approx. 1,500\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)\u22126.5[6]Details89 Her AMass1.0[7]\u00a0M\u2609Radius71.0[7]\u00a0R\u2609Luminosity8,350[7]\u00a0L\u2609Surface gravity (log\u00a0g)0.55[3]\u00a0cgsTemperature6,550[3]\u00a0KMetallicity\u22120.5[3]Rotational velocity (v\u00a0sin\u00a0i)23[8]\u00a0km\/sOther designationsDatabase referencesSIMBADdataExoplanet Archivedata89 Herculis is a binary star system located about 4,700\u00a0light years away from the Sun in the northern constellation of Hercules. It is visible to the naked eye as a faint, fifth magnitude star. The system is moving closer to the Earth with a heliocentric radial velocity of \u221228.5\u00a0km\/s.[5]This is a spectroscopic binary with the pair surrounded by a dusty disc, and an hourglass-shaped nebula formed from outflowing gas.[10] The mass of the nebula is about 0.018\u00a0M\u2609, of which a majority is in the outflow.[10] The system shows variable brightness and spectral line profiles.[11] The companion has a very low mass and luminosity and orbits the primary in 288 days.[3]  The primary component has a stellar classification of F2Ibe,[3] and is among a rare class of post-asymptotic giant branch stars \u2013 low-mass stars in the last stages of their lives, highly inflated to appear as supergiants.[3] It is classified as a semiregular variable star, subtype SRd, and ranges from magnitude 5.3 down to 5.5 over a period of around 68 days.[2] The star has expanded to 71[7] times the Sun’s radius and is radiating 8,350[7] times the Sun’s luminosity from its enlarged photosphere at an effective temperature of 6,550\u00a0K.[3]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4References[edit]^ a b c d e Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051\/0004-6361\/201833051. Gaia DR2 record for this source at VizieR.^ a b c Samus, N. N.; Durlevich, O. V.;  et\u00a0al. (2009). “VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)”. VizieR On-line Data Catalog: B\/GCVS. Originally Published in: 2009yCat….102025S. 1. Bibcode:2009yCat….102025S.^ a b c d e f g h Hillen, M.; Verhoelst, T.; Van Winckel, H.; Chesneau, O.; Hummel, C. A.; Monnier, J. D.; Farrington, C.; Tycner, C.; Mourard, D.; Ten Brummelaar, T.; Banerjee, D. P. K.; Zavala, R. T. (2013). “An interferometric study of the post-AGB binary 89 Herculis. I. Spatially resolving the continuum circumstellar environment at optical and near-IR wavelengths with the VLTI, NPOI, IOTA, PTI, and the CHARA Array”. Astronomy & Astrophysics. 559: A111. arXiv:1308.6715. Bibcode:2013A&A…559A.111H. doi:10.1051\/0004-6361\/201321616. S2CID\u00a0119182156.^ a b Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS\/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237….0D.^ a b Wilson, Ralph Elmer (1953). “General catalogue of stellar radial velocities”. Washington. Bibcode:1953GCRV..C……0W.^ Kipper, T\u00f5nu (2011). “On the Optical Spectrum of 89 Her”. Baltic Astronomy. 20: 65. Bibcode:2011BaltA..20…65K. doi:10.1515\/astro-2017-0269.^ a b c d e ^ Hoffleit, Dorrit; Jaschek, Carlos (1991). “The Bright star catalogue”. New Haven. Bibcode:1991bsc..book…..H.^ “89 Her”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 2019-06-15.^ a b Gallardo Cava, I.; Alcolea, J.; Bujarrabal, V.; G\u00f3mez-Garrido, M.; Castro-Carrizo, A. (2023). “The nebula around the binary post-AGB star 89 Herculis”. Astronomy & Astrophysics. 671: A80. arXiv:2301.06965. Bibcode:2023A&A…671A..80G. doi:10.1051\/0004-6361\/202244415. S2CID\u00a0255942182.^ Burki, G.; Mayor, M.; Rufener, F. (1980). “Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry”. Astronomy and Astrophysics Supplement. 42: 383. Bibcode:1980A&AS…42..383B.^ Fernie, J. D.; Seager, S. (September 1995). “V441 Herculis (89 Her) and V814 Herculis (HD 161796) in 1993 and 1994”. Publications of the Astronomical Society of the Pacific. 107: 853\u2013855. Bibcode:1995PASP..107..853F. doi:10.1086\/133632. S2CID\u00a0250751611. Retrieved 10 January 2022.External links[edit]Kaler’s, James B. “89 Herculis”. Stars. University of Illinois. Retrieved 2019-06-16.     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