Xi2 Lupi
Star in the constellation Lupus
Xi2 Lupi (ξ2 Lup, ξ2 Lupi) is a member of a double star [8] with Xi1 Lupi in the southern constellation of Lupus . As of 2004, the pair had an angular separation of 10.254 arcseconds along a position angle of 49.21°.[9] Xi2 Lupi is visible to the naked eye with an apparent visual magnitude of 5.55.[2] Based upon an annual parallax shift of 21.71[1] mas as seen from Earth, it is located roughly 150 light-years from the Sun . It has a peculiar velocity of 14.3± 1.9 km/s relative to its neighbors, and is probably (86% chance) a runaway star .[10]
This is a B-type main-sequence star with a stellar classification of B9 V.[3] It has an estimated 2.38[5] times the mass of the Sun and radiates 10.6[6] times the Sun's luminosity from its outer atmosphere at an effective temperature of 9,725 K .[5] Xi2 Lupi is about 381 million years old and is spinning relatively rapidly with a projected rotational velocity of 184 km/s.[5]
References
^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 , Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 .
^ a b c Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics , 355 : L27, Bibcode :2000A&A...355L..27H , doi :10.1888/0333750888/2862 .
^ a b Levato, H. (January 1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics Supplement Series , 19 : 91–99, Bibcode :1975A&AS...19...91L .
^ 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 59451347 , A61.
^ a b c d e f g h David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren 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 33401607 .
^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–57, arXiv :1208.2037 , Bibcode :2012MNRAS.427..343M , doi :10.1111/j.1365-2966.2012.21873.x , S2CID 118665352 .
^ "ksi02 Lup" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2017-03-08 .
^ 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): 869–879, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
^ Sinachopoulos, D.; et al. (September 2007), "CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars", Astronomy and Astrophysics , 472 (3): 1055–1057, Bibcode :2007A&A...472.1055S , doi :10.1051/0004-6361:20066290 , hdl :11427/35072 .
^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society , 410 (1): 190–200, arXiv :1007.4883 , Bibcode :2011MNRAS.410..190T , doi :10.1111/j.1365-2966.2010.17434.x , S2CID 118629873 .