氐宿增一
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 天秤座 |
| 星官 | 氐（氐宿） |
| 赤經 | 15h 00m 58.34830s[2] |
| 赤緯 | -08° 31′ 08.2104″[2] |
| 視星等（V） | 4.93[3] |
| 特性 | |
| 光譜分類 | B9.5V[4] |
| U−B 色指數 | –0.10[5] |
| B−V 色指數 | +0.00[5] |
| 變星類型 | 大陵五型的食變星（EA/SD）[6] |
| 天體測定 | |
| 徑向速度 (Rv) | −38.7±2[7] km/s |
| 自行 (μ) | 赤經：−63.051[2] mas/yr 赤緯：−6.024[2] mas/yr |
| 視差 (π) | 9.2824 ± 0.4725[2] mas |
| 距離 | 350 ± 20 ly (108 ± 5 pc) |
| 絕對星等 (MV) | +0.15[8] |
| 軌道[9] | |
| 繞行週期 (P) | 2.3274 d |
| 偏心率 (e) | 0.07 |
| 半振幅 (K1) (primary) | 76.6 km/s |
| 半振幅 (K2) (secondary) | 218.7 km/s |
| 詳細資料 | |
| 氐宿增一A | |
| 質量 | 4.9±0.2[9] M☉ |
| 半徑 | 3.94[10] R☉ |
| 亮度 | 86[8] L☉ |
| 溫度 | 8800[10] K |
| 年齡 | 0.5[10] Gyr |
| 氐宿增一B | |
| 質量 | 1.7±0.2[9] M☉ |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 資料 |
氐宿增一（英語：Delta Librae，從δ Librae 拉丁化）是在星座天秤座的一顆變星。它與天秤座γ、室女座μ形成一個阿卡德語傳統名稱為「Zuben Elakribi」(南鰲)的變體之一[11]，和日語月府的「Mulu-izi」[12]（意思是「火人」[13]）。
氐宿增一距離地球約300光年，主星A屬於光譜分類B9.5V，表明它是B型主序星。它的視星等為4.93，因此肉眼可見[3]，並以−39公里/秒的徑向速度向太陽靠近[7]。這是一個類似大陵五的食雙星恆星系統，週期為2.3274天，離心率為0.07[9]。它的視星等在4.91m與5.9m之間變化[14]。伴星B正在填充其洛希瓣，有證據表明過去有大規模的質量轉移，該伴星比主星演化得更快[9]。
它與畢宿八（金牛座λ）由弗蘭克·施萊辛格（英語：Frank Schlesinger）於1911年觀察到，是最早發現其譜線因旋轉致寬的恆星[15]。
參考資料
- ^ Shobbrook, R. R. Photometry of 20 eclipsing and ellipsoidal binary systems. The Journal of Astronomical Data. December 2005, 11: 7 [10 July 2022]. Bibcode:2005JAD....11....7S. （原始內容存檔於2023-11-20）.
- ^ 2.0 2.1 2.2 2.3 2.4 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211
. doi:10.1051/0004-6361/202243940 . 已忽略未知參數|collaboration=(幫助) Gaia DR3 record for this source at VizieR. - ^ 3.0 3.1 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. Bibcode:2002yCat.2237....0D.
- ^ Houk, N.; Swift, C. Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5. Michigan Spectral Survey. 1999, 5. Bibcode:1999MSS...C05....0H.
- ^ 5.0 5.1 Johnson, H. L. UBVRIJKL Photometry of the Bright Stars. Communications of the Lunar and Planetary Laboratory. 1966, 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Del Lib. The International Variable Star Index. AAVSO – American Association of Variable Star Observers. [27 September 2017]. （原始內容存檔於2020-10-03）.
- ^ 7.0 7.1 Wilson, Ralph Elmer. General catalogue of stellar radial velocities. Carnegie Institute Washington D.C. Publication. 1953. Bibcode:1953GCRV..C......0W.
- ^ 8.0 8.1 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.
- ^ 9.0 9.1 9.2 9.3 9.4 Tomkin, J. Secondaries of eclipsing binaries. I. Detection of the secondary of Delta Librae. Astrophysical Journal. April 1978, 221: 608–615. Bibcode:1978ApJ...221..608T. doi:10.1086/156064 .
- ^ 10.0 10.1 10.2 Rhee, Joseph H.; Song, Inseok; Zuckerman, B.; McElwain, Michael. Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs. The Astrophysical Journal. 2007, 660 (2): 1556–1571. Bibcode:2007ApJ...660.1556R. S2CID 11879505. arXiv:astro-ph/0609555 . doi:10.1086/509912.
- ^ Becvar, Antonin. Atlas coeli II - Katalog 1950.0. 1964. Bibcode:1964ack..book.....B.
- ^ Allen, R. H. Star Names: Their Lore and Meaning rep. New York, NY: Dover Publications Inc. 1963: 277, 473.
- ^ Brown Jr., R. Remarks on the Euphratean Astronomical Names of the Signs of the Zodiac. Proceedings of the Society of Biblical Archaeology. 1891, 13: 194.
- ^ Samus, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. General Catalogue of Variable Stars. Astronomy Reports. GCVS 5.1. 2017, 61 (1): 80–88 [2018-01-07]. Bibcode:2017ARep...61...80S. S2CID 125853869. doi:10.1134/S1063772917010085. （原始內容存檔於2020-11-05）.
- ^ Schlesinger, F. Rotation of Stars about their Axes. Monthly Notices of the Royal Astronomical Society. 1909, 71 (9): 719. Bibcode:1911MNRAS..71..719S. doi:10.1093/mnras/71.9.719 .
