おおぐま座パイ1星とは - わかりやすく解説 Weblio辞書

おおぐま座パイ1星

出典: フリー百科事典『ウィキペディア（Wikipedia）』 (2022/07/24 15:50 UTC 版)

おおぐま座π¹星（おおぐまざパイ1せい、π¹ Ursae Majoris、π¹ UMa）は、おおぐま座の恒星である。見かけの等級は5.63で、年周視差を基に計算された太陽系からの距離は、約47光年である^[1]^[3]^{[注 1]}。比較的若い太陽型星で、おおぐま座運動星団に属するとみられる^[8]^[7]。りゅう座BY型変光星に分類される変光星で、X線フレアも観測されている^[2]^[10]。

脚注

注釈

^ ^a ^b ^c パーセクは1 ÷ 年周視差（秒）より計算、光年は1÷年周視差（秒）×3.2615638より計算
^ 出典での表記は、 $\log g[{\mbox{cgs}}]=4.46$
^ 他の恒星は、おおぐま座A星（スペイン語版）が Althiba I、π²星が Althiba III、ρ星（英語版）が Althiba IV、σ¹星（英語版）が Althiba V、σ²星（英語版）が Althiba VI、d星（英語版）が Althiba VII となっている^[16]。

出典

^ ^a ^b ^c ^d ^e ^f ^g ^h Bochanski, J. J.; et al. (2001-03-09), “Starspots on the Young Solar-type Star π¹ Ursae Maioris”, Information Bulletin on Variable Stars 5043: 1, Bibcode: 2001IBVS.5043....1B
^ ^a ^b ^c Samus, N. N.; et al. (2009-01), “General Catalogue of Variable Stars”, VizieR On-line Data Catalog: B/gcvs, Bibcode: 2009yCat....102025S
^ ^a ^b ^c ^d ^e ^f ^g ^h “pi.01 UMa -- Variable of BY Dra type”. SIMBAD. CDS. 2021年6月24日閲覧。
^ da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (2015-08), “Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets”, Astronomy & Astrophysics 580: A24, Bibcode: 2015A&A...580A..24D, doi:10.1051/0004-6361/201525770
^ ^a ^b ^c ^d ^e ^f Ribas, Ignasi; et al. (2005-03), “Evolution of the Solar Activity over Time and Effects on Planetary Atmospheres. I. High-Energy Irradiances (1-1700 Å)”, Astrophysical Journal 622 (1): 680-694, Bibcode: 2005ApJ...622..680R, doi:10.1086/427977
^ ^a ^b ^c Gaidos, Eric J.; Gonzalez, Guillermo (2002-07), “Stellar atmospheres of nearby young solar analogs”, New Astronomy 7 (5): 211-226, arXiv:astro-ph/0203518, Bibcode: 2002NewA....7..211G, doi:10.1016/S1384-1076(02)00108-2
^ ^a ^b ^c ^d Montes, D.; et al. (2001-12), “Chromospheric activity, lithium and radial velocities of single late-type stars possible members of young moving groups”, Astronomy & Astrophysics 379: 976-991, Bibcode: 2001A&A...379..976M, doi:10.1051/0004-6361:20011385
^ ^a ^b Gaidos, E. J.; Henry, G. W.; Henry, S. M. (2000-08), “Spectroscopy and Photometry of Nearby Young Solar Analogs”, Astronomical Journal 120 (2): 1006-1013, Bibcode: 2000AJ....120.1006G, doi:10.1086/301488
^ ^a ^b ^c ^d Rosén, L.; et al. (2016-), “Magnetic fields of young solar twins”, Astronomy & Astrophysics 593: A35, Bibcode: 2016A&A...593A..35R, doi:10.1051/0004-6361/201628443
^ ^a ^b Landini, M.; et al. (1986-03), “EXOSAT detection of an X-ray flare from the solar type star π¹ UMa”, Astronomy & Astrophysics 157 (2): 217-222, Bibcode: 1986A&A...157..217L
^ Soderblom, David R.; Mayor, Michel (1993-01), “Stellar Kinematic Groups. I. The URSA Major Group”, Astronomical Journal 105 (1): 226-249, Bibcode: 1993AJ....105..226S, doi:10.1086/116422
^ Schaefer, Bradley E.; King, Jeremy R.; Deliyannis, Constantine P. (2000-02), “Superflares on Ordinary Solar-Type Stars”, Astrophysical Journal 529 (2): 1026-1030, Bibcode: 2000ApJ...529.1026S, doi:10.1086/308325
^ Bryden, G.; et al. (2006-01), “Frequency of Debris Disks around Solar-Type Stars: First Results from a Spitzer MIPS Survey”, Astrophysical Journal 636 (2): 1098-1113, Bibcode: 2006ApJ...636.1098B, doi:10.1086/498093
^ Krivov, Alexander V.; et al. (2008-11), “Collisional and Thermal Emission Models of Debris Disks: Toward Planetesimal Population Properties”, Astrophysical Journal 687 (1): 608-622, Bibcode: 2006ApJ...636.1098B, doi:10.1086/591507
^ Allen, R. H. (1963), “Ursa Major, the Greater Bear”, Star Names: Their Lore and Meaning (Reprint ed.), New York: Dover Publications Inc., ISBN 0-486-21079-0
^ ^a ^b Rhoads, Jack W. (1971-11-15), “A Reduced Star Catalog Containing 537 Named Stars”, NASA Technical Memorandum (Jet Propulsion Laboratory, California Institute of Technology), 33-507