[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/omega-herculis-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki40\/omega-herculis-wikipedia\/","headline":"Omega Herculis – Wikipedia","name":"Omega Herculis – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Variable star in the constellation Hercules Omega Herculis Historical view of the Hercules","datePublished":"2016-11-01","dateModified":"2016-11-01","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki40\/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\/c4\/Hercules_Historical_View.png\/250px-Hercules_Historical_View.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/c\/c4\/Hercules_Historical_View.png\/250px-Hercules_Historical_View.png","height":"289","width":"250"},"url":"https:\/\/wiki.edu.vn\/en\/wiki40\/omega-herculis-wikipedia\/","about":["Wiki"],"wordCount":6668,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Variable star in the constellation HerculesOmega HerculisHistorical view of the Hercules constellation showing the star Kajam (\u03c9 Her) as “the club” in the hero’s right hand.Observation dataEpoch J2000.0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000.0 (ICRS)ConstellationHerculesRight ascension16h 25m 24.95425s[1]Declination+14\u00b0\u00a001\u2032\u00a059.7711\u2033[1]Apparent\u00a0magnitude\u00a0(V)4.5821[1](4.58 + 11.5)[2]CharacteristicsSpectral\u00a0typeA2\u00a0Vp\u00a0CrSr[3]U\u2212B color index+0.01[4]B\u2212V color index+0.00[4]Variable\u00a0type\u03b12 CVn[5]AstrometryRadial velocity (Rv)\u22125.90\u00b10.74[6]\u00a0km\/sProper motion (\u03bc) RA:\u00a0+40.86[1]\u00a0mas\/yr Dec.:\u00a0\u221259.71[1]\u00a0mas\/yr Parallax (\u03c0)13.04\u00a0\u00b1\u00a00.64\u00a0mas[1]Distance250 \u00b1 10\u00a0ly (77 \u00b1 4\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)0.29\u00b10.15[7]Details\u03c9 Her AMass2.14[8]\u00a0M\u2609Radius3.30[9]\u00a0R\u2609Luminosity70[10]\u00a0L\u2609Surface gravity (log\u00a0g)3.51\u00b10.35[11]\u00a0cgsTemperature10,052\u00b1320[11]\u00a0KMetallicity [Fe\/H]+0.47\u00b10.15[11]\u00a0dexRotation2.951[12]\u00a0dRotational velocity (v\u00a0sin\u00a0i)55[13]\u00a0km\/sAge149[8]\u00a0MyrOther designations Cujam, \u03c9\u00a0Her, 24\u00a0Her, 51\u00a0Ser,BD+14\u00b03049, FK5\u00a0613, HD\u00a0148112, HIP\u00a080463, HR\u00a06117, SAO\u00a0102153, WDS\u00a0J16254+1402AB.[14]Database referencesSIMBADdataOmega Herculis (\u03c9 Herculis, abbreviated Ome Her, \u03c9 Her) is a binary star[2] system in the northern constellation of Hercules. Based upon an annual parallax shift of 13.04\u00a0mas as seen from Earth, it is located around 250\u00a0light-years from the Sun. It is faintly visible to the naked eye, having a combined apparent visual magnitude of 4.58.[1] The system is a candidate for membership in the Ursa Major Moving Group, although this remains uncertain.[7]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The two components are designated Omega Herculis A (officially named Cujam , the traditional name of the system)[15] and B.Nomenclature[edit]\u03c9 Herculis (Latinised to Omega Herculis) is the system’s Bayer designation. It previously bore the Flamsteed designation of 51 Serpentis before being added to Hercules.[16] The designations of the two components as Omega Herculis A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[17]The system bore the traditional name Cujam (also written as Cajam and Kajam), meaning (“club”).[18] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[19][20] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[21] It approved the name Cujam for the component Omega Herculis A on February 1, 2017 and it is now so included in the List of IAU-approved Star Names.[15]In Chinese, \u6597 (D\u01d2u), meaning Dipper for Liquid, refers to an asterism consisting of Omega Herculis, 49 Serpentis, 13 Herculis, 29 Herculis and 33 Herculis.[22] Consequently, the Chinese name for Omega Herculis itself is \u6597\u4e00 (D\u01d2u y\u012b, English: the First Star of Dipper for Liquid).[23]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Properties[edit]The primary, Omega Herculis A, is a chemically peculiar Ap star with a stellar classification of A2\u00a0Vp\u00a0CrSr.[3] The spectrum displays abnormally strong absorption lines of chromium and strontium, and weak lines of calcium and magnesium.[3] An A-type star, it has an estimated 2.14[8] times the mass of the Sun and 3.30[9] times the Sun’s radius. The star is around 149[8] million years old and is radiating 70[10] times the solar luminosity from its photosphere at an effective temperature of 10,052\u00a0K.[11]This component is an Alpha2 Canum Venaticorum variable[5] with a brightness amplitude of 0.4 magnitude and a 2.951\u00a0day phase that presumably matches the rotation period. The pattern of variation shows that there are regions of the star’s surface where the concentrations of elements differ. The star also displays short period variations on the order of 2.5\u00a0hours.[12] It has a mean effective magnetic field value of 209\u00d710\u22124\u00a0T.[24]The secondary, Omega Herculis B, is a magnitude 11.5 companion star.[2] As of 2010, it was located at an angular separation of 0.80\u00a0arc seconds along a position angle of 294\u00b0.[25]References[edit]^ a b c d e f g van Leeuwen, F. (2007), “Validation of the new Hipparcos reduction”, Astronomy and Astrophysics, 474 (2): 653\u2013664, arXiv:0708.1752, Bibcode:2007A&A…474..653V, doi:10.1051\/0004-6361:20078357, S2CID\u00a018759600.^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), “A catalogue of multiplicity among bright stellar systems”, Monthly Notices of the Royal Astronomical Society, 389 (2): 869\u2013879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111\/j.1365-2966.2008.13596.x, S2CID\u00a014878976.^ a b c Abt, Helmut A.; Morrell, Nidia I. (July 1995), “The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars”, Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS…99..135A, doi:10.1086\/192182.^ a b Mermilliod, J.-C. (1986), “Compilation of Eggen’s UBV data, transformed to UBV (unpublished)”, Catalogue of Eggen’s UBV Data, SIMBAD, Bibcode:1986EgUBV……..0M.^ a b Dubath, P.;  et\u00a0al. (2011), “Random forest automated supervised classification of Hipparcos periodic variable stars”, Monthly Notices of the Royal Astronomical Society, 414 (3): 2602\u201317, arXiv:1101.2406, Bibcode:2011MNRAS.414.2602D, doi:10.1111\/j.1365-2966.2011.18575.x, S2CID\u00a0118560311.^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), “Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project”, Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A…546A..61D, doi:10.1051\/0004-6361\/201219219, S2CID\u00a059451347, A61.^ a b King, Jeremy R.;  et\u00a0al. (April 2003), “Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group”, The Astronomical Journal, 125 (4): 1980\u20132017, Bibcode:2003AJ….125.1980K, doi:10.1086\/368241.^ a b c d David, Trevor J.; Hillenbrand, Lynne A. (2015), “The Ages of Early-Type Stars: Str\u00f6mgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets”, The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ…804..146D, doi:10.1088\/0004-637X\/804\/2\/146, S2CID\u00a033401607.^ a b Shulyak, D.;  et\u00a0al. (2014), “Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities”, Monthly Notices of the Royal Astronomical Society, 443 (2): 1629, arXiv:1406.6093, Bibcode:2014MNRAS.443.1629S, doi:10.1093\/mnras\/stu1259, S2CID\u00a096452769.^ a b McDonald, I.;  et\u00a0al. (2012), “Fundamental Parameters and Infrared Excesses of Hipparcos Stars”, Monthly Notices of the Royal Astronomical Society, 427 (1): 343\u201357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111\/j.1365-2966.2012.21873.x, S2CID\u00a0118665352.^ a b c d Prugniel, Ph.;  et\u00a0al. (2011), “The atmospheric parameters and spectral interpolator for the MILES stars”, Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A…531A.165P, doi:10.1051\/0004-6361\/201116769, S2CID\u00a054940439.^ a b Aslanov, I. A. (August 1987), “Spectral Variable Star HD148112 – Spectrophotometry of Lines”, Soviet Astronomy, 31 (4): 425, Bibcode:1987SvA….31..425A.^ Abt, Helmut A.;  et\u00a0al. (July 2002), “Rotational Velocities of B Stars”, The Astrophysical Journal, 573 (1): 359\u2013365, Bibcode:2002ApJ…573..359A, doi:10.1086\/340590.^ “ome Her”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 2017-03-31.^ a b “Naming Stars”. IAU.org. Retrieved 16 December 2017.^ Wagman, M. (August 1987), “Flamsteed’s Missing Stars”, Journal for the History of Astronomy, 18 (3): 209\u2013223, Bibcode:1987JHA….18..209W, doi:10.1177\/002182868701800305, S2CID\u00a0118445625.^ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). “On the naming convention used for multiple star systems and extrasolar planets”. arXiv:1012.0707 [astro-ph.SR].^ Kaler, James B. (August 22, 2013), “Cujam”, Stars, University of Illinois, retrieved 2016-05-13.^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.^ IAU Formally Approves 227 Star Names, International Astronomical Union, retrieved 24 November 2016.^ “WG Triennial Report (2015-2018) – Star Names” (PDF). p.\u00a05. Retrieved 2018-07-14.^ (in Chinese) \u4e2d\u570b\u661f\u5ea7\u795e\u8a71, written by \u9673\u4e45\u91d1. Published by \u53f0\u7063\u66f8\u623f\u51fa\u7248\u6709\u9650\u516c\u53f8, 2005, ISBN\u00a0978-986-7332-25-7.^ (in Chinese) \u9999\u6e2f\u592a\u7a7a\u9928 – \u7814\u7a76\u8cc7\u6e90 – \u4eae\u661f\u4e2d\u82f1\u5c0d\u7167\u8868 Archived 2009-09-29 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.^ Glagolevskij, Yu. V. (September 2007), “Magnetic-field dependence of chemical anomalies in CP stars”, Astrophysical Bulletin, 62 (3): 244\u2013256, Bibcode:2007AstBu..62..244G, doi:10.1134\/S1990341307030054, S2CID\u00a0122706004.^ Mason, B. D.;  et\u00a0al. (2014), “The Washington Visual Double Star Catalog”, The Astronomical Journal, 122 (6): 3466\u20133471, Bibcode:2001AJ….122.3466M, doi:10.1086\/323920.     (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/omega-herculis-wikipedia\/#breadcrumbitem","name":"Omega Herculis – Wikipedia"}}]}]