[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/2-andromedae-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/2-andromedae-wikipedia\/","headline":"2 Andromedae – Wikipedia","name":"2 Andromedae – Wikipedia","description":"From Wikipedia, the free encyclopedia Binary star system in the constellation Andromeda 2 Andromedae, abbreviated 2 And, is a binary","datePublished":"2019-08-13","dateModified":"2019-08-13","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki24\/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:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/2-andromedae-wikipedia\/","wordCount":3871,"articleBody":"From Wikipedia, the free encyclopediaBinary star system in the constellation Andromeda2 Andromedae, abbreviated 2 And, is a binary star[4] system in the northern constellation of Andromeda. 2 Andromedae is the Flamsteed designation. It is a faint star system but visible to the naked eye with a combined apparent visual magnitude of 5.09.[3] Based upon an annual parallax shift of 7.7\u00a0mas,[2] it is located 420\u00a0light years away. The binary nature of the star was discovered by American astronomer Sherburne Wesley Burnham at Lick Observatory in 1889.[12] The pair orbit each other over a period of 74\u00a0years with a high eccentricity of 0.8.[4]The magnitude 5.26[4] primary, designated component A, is an A-type main-sequence star based on a stellar classification of A1V[5] or A2V,[4] although it may have already left the main sequence.[8] It was identified as a candidate Lambda Bo\u00f6tis star, but this was ruled out by Paunzen et al. (2003) as it doesn’t match the typical characteristics of these objects.[13] Although 2 And does not display a significant infrared excess, it is a shell star that displays varying absorption features due to circumstellar dust grains. This may indicate it has an orbiting debris disk containing gas that is being viewed edge-on.[14] The star is about 100\u00a0million years old and is spinning rapidly with a projected rotational velocity of 212\u00a0km\/s.[9]The magnitude 7.43[4] secondary companion, component B, is a suspected variable star and may be a Delta Scuti variable.[4]  Alternatively, it may be an ellipsoidal variable with a brown dwarf companion.[8] It is an F-type main-sequence star with a class of F1V\/F4.[4]References[edit]^ “MAST: Barbara A. Mikulski Archive for Space Telescopes”. Space Telescope Science Institute. Retrieved 8 December 2021.^ a b c d e f 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.Vizier catalog entry ^ a b c Anderson, E.; Francis, Ch. (2012). “XHIP: An extended hipparcos compilation”. Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL…38..331A. doi:10.1134\/S1063773712050015. S2CID\u00a0119257644.^ a b c d e f g h i j k Rica Romero, F. M. (2010). “Orbital elements for eight binaries. Study of the nature of wide components. I” (PDF). Revista Mexicana de Astronom\u00eda y Astrof\u00edsica. 46: 263\u2013277. Bibcode:2010RMxAA..46..263R.^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). “The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars”. The Astrophysical Journal Supplement Series. 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. Bibcode:1986EgUBV……..0M.^ Gontcharov, G. A. (2006). “Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system”. Astronomy Letters. 32 (11): 759\u2013771. arXiv:1606.08053. Bibcode:2006AstL…32..759G. doi:10.1134\/S1063773706110065. S2CID\u00a0119231169.^ a b c d e f g h i j Jerzykiewicz, M.;  et\u00a0al. (2015). “The 2003\u20132004 multisite photometric campaign for the \u03b2 Cephei and eclipsing star 16 (EN) Lacertae with an appendix on 2 Andromedae, the variable comparison star”. Monthly Notices of the Royal Astronomical Society. 454 (1): 724\u2013740. arXiv:1508.05250. Bibcode:2015MNRAS.454..724J. doi:10.1093\/mnras\/stv1958. S2CID\u00a0119220117.^ a b Zorec, J.; Royer, F. (2012). “Rotational velocities of A-type stars. IV. Evolution of rotational velocities”. Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A…537A.120Z. doi:10.1051\/0004-6361\/201117691. S2CID\u00a055586789.^ Gullikson, Kevin;  et\u00a0al. (August 2016). “The Close Companion Mass-ratio Distribution of Intermediate-mass Stars”. The Astronomical Journal. 152 (2): 13. arXiv:1604.06456. Bibcode:2016AJ….152…40G. doi:10.3847\/0004-6256\/152\/2\/40. S2CID\u00a0119179065. 40.^ “2 And”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved September 11, 2018.^ Burnham, S. W. (1894). “Sixteenth Catalogue of New Double Stars Discovered at the Lick Observatory”. Publications of Lick Observatory. 2: 197\u2013205. Bibcode:1894PLicO…2..197B.^ Paunzen, E.;  et\u00a0al. (June 2003). “A study of lambda Bootis type stars in the wavelength region beyond 7000 \u00c5”. Astronomy and Astrophysics. 404 (2): 579\u2013591. arXiv:astro-ph\/0303191. Bibcode:2003A&A…404..579P. doi:10.1051\/0004-6361:20030284.^ Roberge, Aki; Weinberger, Alycia J. (March 2008). “Debris Disks around Nearby Stars with Circumstellar Gas”. The Astrophysical Journal. 676 (1): 509\u2013517. arXiv:0711.4561. Bibcode:2008ApJ…676..509R. doi:10.1086\/527314. S2CID\u00a018407657.External links[edit]  "},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/2-andromedae-wikipedia\/#breadcrumbitem","name":"2 Andromedae – Wikipedia"}}]}]