軍井一
軍井一（Iota Leporis，ι Leporis）是在南天星座天兔座的一顆三合星[5]系統。它的視星等為4.45等，肉眼可見，它是藍白光的點光源[3]。基於從地球量測的每年14.07mas的視差[2]，該系統位於距離太陽大約232光年之處
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 天兔座 |
| 星官 | 軍井（參宿） |
| 赤經 | 05h 12m 17.90190s[2] |
| 赤緯 | −11° 52′ 09.1863″[2] |
| 視星等（V） | 4.45[3] |
| 特性 | |
| 光譜分類 | B7.5 Vn[4] + K7.2 XR? + G8 Ve[5] |
| U−B 色指數 | −0.40[3] |
| B−V 色指數 | −0.10[3] |
| 天體測定 | |
| 徑向速度 (Rv) | +23.50[6] km/s |
| 自行 (μ) | 赤經：+24.39[2] mas/yr 赤緯：−31.02[2] mas/yr |
| 視差 (π) | 14.07 ± 0.16[2] mas |
| 距離 | 232 ± 3 ly (71.1 ± 0.8 pc) |
| 絕對星等 (MV) | 0.01[7] |
| 詳細資料 | |
| 軍井一A（ι Lep A） | |
| 質量 | 3.37±0.02[8] M☉ |
| 表面重力 (log g) | 4.25[9] |
| 亮度 | 153[8] L☉ |
| 溫度 | 13,781±469[9] K |
| 自轉速度 (v sin i) | 185[9] km/s |
| 年齡 | 94[7] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 資料 |
主星A是一顆B型主序星，恆星分類為B7.5Vn[4]，此處尾碼的「n」表示有自轉引起的「模糊」吸收線。它的年齡大約9,400萬[7]，並且有185公里/秒的投影自轉速度[9]，估計它的質量是太陽質量的3.4倍[8]，來自光球的有效溫度為13,781K [9]，使它輻射的光度是太陽光度的153倍[8]。 它有一顆緊密的伴星，是 X射線發射的來源。這顆恆星的質量很可能至少是太陽的1.05倍[7]。第三顆星是天兔座AM，是一顆天龍座BY型變星[11]，視星等9.92等 [3]，光譜類行為G8Ve[12]，角距離12.7"[13]。
參考資料
編輯- ^ Huélamo, N.; Fernández, M.; Neuhäuser, R.; Wolk, S. J. Rotation periods of Post-T Tauri stars in Lindroos systems (PDF). Astronomy and Astrophysics. December 2004, 428 (3): 953–967 [29 June 2022]. Bibcode:2004A&A...428..953H. S2CID 10656237. arXiv:astro-ph/0408226
. doi:10.1051/0004-6361:20034442. （原始內容存檔 (PDF)於2023-10-28）.
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
- ^ 3.0 3.1 3.2 3.3 3.4 Ducati, J. R., VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system, CDS/ADC Collection of Electronic Catalogues, 2002, 2237: 0, Bibcode:2002yCat.2237....0D.
- ^ 4.0 4.1 Garrison, R. F.; et al, The late B-type stars: refined MK classification, confrontation with Stromgren photometry, and the effects of rotation, The Astronomical Journal, 1994, 107 (4): 1556–1564, Bibcode:1994AJ....107.1556G, doi:10.1086/116967.
- ^ 5.0 5.1 Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
- ^ Kharchenko, N. V.; et al, Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations, Astronomische Nachrichten, 2007, 328 (9): 889, Bibcode:2007AN....328..889K, S2CID 119323941, arXiv:0705.0878 , doi:10.1002/asna.200710776.
- ^ 7.0 7.1 7.2 7.3 Hubrig, S.; et al, Search for low-mass PMS companions around X-ray selected late B stars, Astronomy and Astrophysics, June 2001, 372: 152–164, Bibcode:2001A&A...372..152H, S2CID 17507782, arXiv:astro-ph/0103201 , doi:10.1051/0004-6361:20010452.
- ^ 8.0 8.1 8.2 8.3 Zorec, J.; Royer, F., Rotational velocities of A-type stars. IV. Evolution of rotational velocities, Astronomy & Astrophysics, January 2012, 537: A120, Bibcode:2012A&A...537A.120Z, S2CID 55586789, arXiv:1201.2052 , doi:10.1051/0004-6361/201117691.
- ^ 9.0 9.1 9.2 9.3 9.4 David, Trevor J.; Hillenbrand, Lynne A., 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, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID 33401607, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
- ^ iot Lep. SIMBAD. 斯特拉斯堡天文資料中心. [2017-08-18].
- ^ Kazarovets, E. V.; et al, The 79th name-list of variable stars, Information Bulletin on Variable Stars, 2008, 5863 (1): 1, Bibcode:2008IBVS.5863....1K.
- ^ Gahm, G. F.; et al, A study of visual double stars with early type primaries. I - Spectroscopic results, Astronomy and Astrophysics Supplement Series, 1983, 51: 143–159, Bibcode:1983A&AS...51..143G.
- ^ Dommanget, J.; et al, Catalog of Components of Double & Multiple stars, Observations et Travaux, 2002, 54 (5), Bibcode:2002yCat.1274....0D. Vizier result （頁面存檔備份，存於網際網路檔案館）
