矩尺座ι1
外观
(重定向自HD 143474)
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 矩尺座 |
| 星官 | |
| 赤經 | 16h 03m 32.08942s[1] |
| 赤緯 | −57° 46′ 30.2641″[1] |
| 視星等(V) | 4.69 (5.20 + 5.76 + 8.1)[2] |
| 特性 | |
| 光谱分类 | A7 IV[3] (A4 V + A6 V)[4] |
| 天体测定 | |
| 徑向速度 (Rv) | −14.4±3.7[5] km/s |
| 自行 (μ) | 赤经:−120.01[1] mas/yr 赤纬:−82.09[1] mas/yr |
| 视差 (π) | 25.39 ± 1.25[1] mas |
| 距离 | 128 ± 6 ly (39 ± 2 pc) |
| 軌道[6] | |
| 繞行週期 (P) | 26.84±0.09 yr |
| 半長軸 (a) | 0.328±0.006" |
| 偏心率 (e) | 0.515±0.012 |
| 倾斜角 (i) | 168.7±9.9° |
| 升交点黃經 (Ω) | 42.0±43.2° |
| 近心点 曆元 (T) | 1990.87±0.21 |
| 近心點幅角 (ω) (secondary) | 320.0±44.1° |
| 詳細資料 | |
| ι1 Nor A | |
| 質量 | 1.94[7] M☉ |
| 表面重力 (log g) | 4.25[8] |
| 溫度 | 7,842±267[8] K |
| 年齡 | 731[8] Myr |
| ι1 Nor B | |
| 質量 | 1.65[7] M☉ |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
矩尺座ι1(ι1 Normae)是在南天星座矩尺座的三合星[2]系統。綜合視星等為4.69[2],因此肉眼隱約可見。根據從地球上看到的25.39mas的年度視差偏移[1],該系統距離太陽約128光年。在這個距離上,由於星際塵埃的消光,這些恆星的視星等减少了0.062[3]。
內側對以26.8年的週期、0.33弧秒秒的半長軸和0.515的離心率相互繞軌道運行。它們的恆星分類具有混合的A7 IV[3],與白色調的A型次巨星相匹配。這兩顆恆星確實都是A型主序星。這一對中較亮的成員A,星等5.20[2],光譜類型為A4 V[4],伴星成員B的星等為5.76[2],它的光譜類型為A6V[4]。這兩顆星的質量分別是太陽質量的1.94和1.65倍[3]。第三顆恆星,成員C的星等為8.1[2],質量是太陽的0.88倍[7]。它與其那一對聯星的角距離為10.8弧秒。
參考文獻
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 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
.
- ^ 3.0 3.1 3.2 3.3 Malkov, O. Yu.; et al, Dynamical masses of a selected sample of orbital binaries, Astronomy & Astrophysics, 2012, 546: A69, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774
.
- ^ 4.0 4.1 4.2 Edwards, T. W., MK classification for visual binary components, Astronomical Journal, April 1976, 81: 245–249, Bibcode:1976AJ.....81..245E, doi:10.1086/111879
- ^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, S2CID 59451347, arXiv:1208.3048
, doi:10.1051/0004-6361/201219219, A61.
- ^ Tokovinin, Andrei; et al, Speckle Interferometry at SOAR in 2014, The Astronomical Journal, August 2015, 150 (2): 17, Bibcode:2015AJ....150...50T, S2CID 30737411, arXiv:1506.05718
, doi:10.1088/0004-6256/150/2/50, 50.
- ^ 7.0 7.1 7.2 Tokovinin, A., Comparative statistics and origin of triple and quadruple stars, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 925–938, Bibcode:2008MNRAS.389..925T, S2CID 16452670, arXiv:0806.3263
, doi:10.1111/j.1365-2966.2008.13613.x
.
- ^ 8.0 8.1 8.2 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.
- ^ iot01 Nor. SIMBAD. 斯特拉斯堡天文資料中心. [2017-08-12].