女二
  | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 寶瓶座[1] |
| 星官 | 女 （女宿） |
| 赤經 | 20h 52m 39.23277s[2] |
| 赤緯 | −08° 58′ 59.9499″[2] |
| 視星等（V） | 4.731[3] |
| 特性 | |
| 演化阶段 | 主序星[4] |
| 光谱分类 | A3m[5]或kA4hF1mF3 (III) EuSr[6] |
| U−B 色指数 | +0.149[3] |
| B−V 色指数 | +0.322[3] |
| 天体测定 | |
| 徑向速度 (Rv) | −9.1[7] km/s |
| 自行 (μ) | 赤经：+45.75 mas/yr 赤纬：−33.59 mas/yr |
| 视差 (π) | 20.74 ± 0.29[2] mas |
| 距离 | 157 ± 2 ly (48.2 ± 0.7 pc) |
| 绝对星等 (MV) | +1.31[1] |
| 軌道[8] | |
| 繞行週期 (P) | 2.404±0.002 yr |
| 半長軸 (a) | 0.0565±0.0008 |
| 偏心率 (e) | 0.150±0.024 |
| 倾斜角 (i) | 85.7±1.2° |
| 升交点黃經 (Ω) | 136.6±0.7° |
| 近心点 曆元 (T) | 2018.973±0.068 |
| 近心點幅角 (ω) (secondary) | 308.0±9.8° |
| 半振幅 (K1) (primary) | 3.2±0.6[9] km/s |
| 詳細資料 | |
| A | |
| 質量 | 2.059+0.103 −[10] M☉ |
| 半徑 | 3.151+0.158 −[10] R☉ |
| 表面重力 (log g) | 3.68[11] |
| 亮度 | 20.3[11] L☉ |
| 溫度 | 7,090[11] K |
| 金属量 [Fe/H] | −0.51[11] dex |
| 自轉速度 (v sin i) | 53.7[12] km/s |
| 年齡 | 1.03[4] Gyr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
女二（英語：Mu Aquarii)是在黃道也是天球赤道星座寶瓶座中的一對聯星系統[14]。「寶瓶座μ」的名稱為拜耳命名法所賦予，英語：μ Aquarii拉丁化後的縮寫為Mu Aqr或μ Aqr。該恆星肉眼可見，綜合視星等為4.7[3]。根據視差測量，該系統的距離約為 157光年（48秒差距）[2]。它正以−9.1km速率的徑向速度向太陽漂移[7]。
赫爾穆特·A·阿布特於961年初步確認這顆恆星為單線光譜聯星[15]。其軌道週期為2.404年，軌道離心率（橢圓度）為0.150[8]。這對組合已透過斑點干涉法解析，顯示出角距離僅為0.06″[16]。
可見光的光譜與A3m的恆星分類相符，加上「m」後綴表示這是一顆Am，或化學特異星[5]。 2020年分類為kA4hF1mF3 (III) EuSr[6]， 表示離子化鈣線「k」符合A4類，氫線「h」屬於F1類，金屬線「m」屬於F3。 此外，銪（Eu）和鍶（Sr）也存在豐度異常。主星質量是太陽的兩倍，且半徑是太陽的3.5倍[10]，它從其有效溫度7,090k的光球層輻射出20倍太陽光度[11]。
名稱
這顆星與天壘城十（寶瓶座ν）合稱為「Albulaan」/ˌælbjəˈlɑːn/，是源自阿拉伯語詞彙「al-bulaʽān」（ألبولعان），意指「兩隻吞噬者」。女二與女（寶瓶座ε，Albali）和女三（寶瓶座ν，Albulaan）都是「al Bulaʽ」（البلع），吞噬者[17][18]。在中國，女（Nǚ)，意義是「女（星群）」（或「女人」），指的是包含女二（寶瓶座μ）、女一（寶瓶座ε）、女三（寶瓶座4）、女增一（寶瓶座5）和女四（寶瓶座κ，寶瓶座3）[19]。因此，中文名稱對寶瓶座μ表示法如下女二（Nǚ èr，英語：the Second Star of Girl / Woman。）[20]。
參考文獻
- ^ 1.0 1.1 Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971
, doi:10.1134/S1063773712050015.
- ^ 2.0 2.1 2.2 2.3 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 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 Gutierrez-Moreno, Adelina; et al, A System of photometric standards, Publications of the Department of Astronomy University of Chile (Publicaciones Universidad de Chile, Department de Astronomy), 1966, 1: 1–17, Bibcode:1966PDAUC...1....1G.
- ^ 4.0 4.1 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy and Astrophysics. 2023, 674: A1. Bibcode:2023A&A...674A...1G. S2CID 244398875. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 .
Gaia DR3 record for this source at VizieR.
- ^ 5.0 5.1 Cowley, A.; et al, A study of the bright A stars. I. A catalogue of spectral classifications, Astronomical Journal, April 1969, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ 6.0 6.1 McGahee, Courtney; et al, A Spectroscopic Classification Survey to Search for New ρ Puppis Stars, The Astronomical Journal, July 2020, 160 (1), id. 52, Bibcode:2020AJ....160...52M, doi:10.3847/1538-3881/ab974c .
- ^ 7.0 7.1 Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington). 1953. Bibcode:1953GCRV..C......0W.
- ^ 8.0 8.1 Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Costa, Edgardo, Speckle Interferometry at SOAR Telescope in 2023, The Astronomical Journal, July 2024, 168 (1): 28, Bibcode:2024AJ....168...28T, ISSN 0004-6256, doi:10.3847/1538-3881/ad4d56 （英语）.
- ^ Abt, H. A.; Levy, S. G., Improved study of metallic-line binaries, The Astrophysical Journal Supplement Series, October 1985, 59: 229–247, Bibcode:1985ApJS...59..229A, doi:10.1086/191070.
- ^ 10.0 10.1 10.2 Kervella, Pierre; et al, Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly, Astronomy & Astrophysics, March 2019, 623: 23, Bibcode:2019A&A...623A..72K, S2CID 119491061, arXiv:1811.08902 , doi:10.1051/0004-6361/201834371, A72.
- ^ 11.0 11.1 11.2 11.3 11.4 Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric. HPIC: The Habitable Worlds Observatory Preliminary Input Catalog. The Astronomical Journal. 2024, 167 (3): 139. Bibcode:2024AJ....167..139T. doi:10.3847/1538-3881/ad25ec .
- ^ Schröder, C.; et al, Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo, Astronomy and Astrophysics, January 2009, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
- ^ * 6 Aqr. SIMBAD. 斯特拉斯堡天文資料中心.
- ^ 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 .
- ^ Abt, Helmut A., The Frequency of Binaries among Metalmc-Line Stars, The Astrophysical Journal Supplement Series, March 1961, 6: 37, Bibcode:1961ApJS....6...37A, doi:10.1086/190060 .
- ^ Hartkopf, William I.; et al, ICCD Speckle Observations of Binary Stars. XXIII. Measurements during 1982-1997 from Six Telescopes, with 14 New Orbits, The Astronomical Journal, 2000, 119 (6): 3084, Bibcode:2000AJ....119.3084H, doi:10.1086/301402 .
- ^ Davis Jr., G. A., The Pronunciations, Derivations, and Meanings of a Selected List of Star Names, Popular Astronomy, October 1944, 52 (3): 12, Bibcode:1944PA.....52....8D.
- ^ Allen, R. H., Star Names: Their Lore and Meaning
Reprint, New York: Dover Publications Inc: 53, 1963 [2010-12-12], ISBN 0-486-21079-0.
- ^ （中文） 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ （中文） AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 14 日 互联网档案馆的存檔，存档日期2011-05-22.