Red giant star in the constellation Eridanus
Pi Eridani,Latinized fromπ Eridani, is astar in theconstellationEridanus. It has anapparent visual magnitude of 4.40,[2] which is bright enough to be seen on a dark, clear night. Based uponparallax measurements, it is located roughly 480 light years from theSun.
This is anevolvedred giant star with astellar classification of M1 III,[5] and is currently on theasymptotic giant branch.[4] It is aslow irregular variable type LB that can increase in magnitude up to 4.38.[3][11] The measuredangular diameter of this star is4.8±0.5 mas.[12] At the estimated distance of Pi Eridani, this yields a physical size of about 77 times theradius of the Sun.[8] It shines with 1,123[9] times the luminosity of the Sun from anouter atmosphere at aneffective temperature of 3,841 K.[9]
- ^abcdevan 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.
- ^abcdMermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data,SIMBAD,Bibcode:1986EgUBV........0M.
- ^abcSamus, N. N.; Durlevich, O. V.; et al. (2007),Combined General Catalogue of Variable Stars (GCVS4.2), retrieved2016-09-30. VizieR On-line Data Catalog:B/gcvs.
{{citation}}:External link in|postscript= - ^abEggen, O. J. (1992), "Asymptotic giant branch stars near the sun",The Astronomical Journal,104: 275,Bibcode:1992AJ....104..275E,doi:10.1086/116239.
- ^abHouk, N.; Smith-Moore, M. (1988),Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4,Bibcode:1988mcts.book.....H.
- ^Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system",Astronomy Letters,32 (11):759–771,arXiv:1606.08053,Bibcode:2006AstL...32..759G,doi:10.1134/S1063773706110065,S2CID 119231169.
- ^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.
- ^abLang, Kenneth R. (2006),Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.),Birkhäuser,ISBN 3-540-29692-1. The radius (R*) is given by:
- ^abcdMcDonald, 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.
- ^"* pi. Eri".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2016-10-11.
{{cite web}}: CS1 maint: postscript (link) - ^Mennessier, M. O.; et al. (August 2001), "Long period variable stars: galactic populations and infrared luminosity calibrations",Astronomy and Astrophysics,374 (3):968–979,arXiv:astro-ph/0105552,Bibcode:2001A&A...374..968M,doi:10.1051/0004-6361:20010764,S2CID 15721872.
- ^Richichi, A.; Percheron, I. (May 2005), "First results from the ESO VLTI calibrators program",Astronomy and Astrophysics,434 (3):1201–1209,arXiv:astro-ph/0501532,Bibcode:2005A&A...434.1201R,doi:10.1051/0004-6361:20042257,S2CID 2847613.
