Star in the constellation Lupus
Upsilon Lupi ,Latinized from υ Lupi, is astar system in the southernconstellation ofLupus . It is faintly visible to the naked eye with anapparent visual magnitude of 5.37.[ 2] parallax shift of 8.02[ 1] mas as seen from Earth, it is located around 410 light years from theSun . The two components of Upsilon Lupi share acommon proper motion through space and most likely form a widebinary star system.[ 10] angular separation of 1.50 arc seconds along aposition angle of 40°.[ 3]
The brighter member, component A, is achemically peculiar Ap star with astellar classification of A0p Si,[ 4] photosphere . Amagnetic field has been detected with aquadratic field strength of± 311.3)× 10−4 T [ 11] solar luminosity from itsouter atmosphere at aneffective temperature of 10,049 K.[ 7]
The magnitude 10.9 companion star, component B, has a visual magnitude of 10.90.[ 3] X-ray emission detected coming from these coordinates.[ 12]
^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 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars",Monthly Notes of the Astronomical Society of Southern Africa ,27 : 11,Bibcode :1968MNSSA..27...11C . ^a b c Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog",The Astronomical Journal ,122 (6):3466– 3471,Bibcode :2001AJ....122.3466M ,doi :10.1086/323920 ^a b Houk, Nancy (1979),Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan,Bibcode :1982mcts.book.....H . ^ 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. ^ 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 119257644 . ^a b c 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 . ^ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars",Contributions from the Institute of Astrophysics and Kwasan Observatory , University of Kyoto,Bibcode :1970crvs.book.....U . ^ "ups Lup" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2017-03-10 .^ 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 . ^ Bychkov, V. D.; et al. (April 2009), "Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars",Monthly Notices of the Royal Astronomical Society ,394 (3):1338– 1350,Bibcode :2009MNRAS.394.1338B ,doi :10.1111/j.1365-2966.2008.14227.x S2CID 120268049 . ^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars",Astronomy and Astrophysics ,475 (2):677– 684,Bibcode :2007A&A...475..677S ,doi :10.1051/0004-6361:20077429
