HD 115404
| 观测数据 曆元 J2000 分點 J2000 | |
|---|---|
| 星座 | 后髮座 |
| HD 115404 A | |
| 赤經 | 13h 16m 51.051430s[1] |
| 赤緯 | +17° 01′ 01.840901″[1] |
| 視星等 (V) | 6.66[2] |
| HD 115404 B | |
| 赤經 | 13h 16m 51.554014s[3] |
| 赤緯 | +17° 00′ 59.892133″[3] |
| 視星等 (V) | 9.50[2] |
| 特性 | |
| U−B 色指数 | +0.64[4] |
| B−V 色指数 | +0.92[4] |
| 特性 | |
| 光谱分类 | K2 V[5] |
| 天体测定 | |
| HD 115404 A | |
| 徑向速度 (Rv) | 7.62 ± 0.09[6] km/s |
| 自行 (μ) | 赤经：7002636285000000000♠636.285±0.028 mas/yr 赤纬：2997735322000000000♠−264.678±0.031 mas/yr |
| 视差 (π) | 91.0176 ± 0.0236[1] mas |
| 距离 | 35.834 ± 0.009 ly (10.987 ± 0.003 pc) |
| HD 115404 B | |
| 徑向速度 (Rv) | 7000595000000000000♠5.95±0.13[3] km/s |
| 自行 (μ) | 赤经：7002649666000000000♠649.666±0.031 mas/yr 赤纬：2997736063000000000♠−263.937±0.026 mas/yr |
| 视差 (π) | 90.9475 ± 0.0232[3] mas |
| 距离 | 35.862 ± 0.009 ly (10.995 ± 0.003 pc) |
| 軌道[7] | |
| 繞行週期 (P) | 770.0 yr |
| 半長軸 (a) | 8.06" |
| 偏心率 (e) | 0.12 |
| 倾斜角 (i) | 93.41° |
| 升交点黃經 (Ω) | 104.66° |
| 近心点 曆元 (T) | B 1875.0 |
| 近心點幅角 (ω) (secondary) | 276.99° |
| 詳細資料 | |
| HD 115404 A | |
| 質量 | 0.70 ± 0.09[8] M☉ |
| 半徑 | 0.76 ± 0.02[8] R☉ |
| 表面重力 (log g) | 4.58 ± 0.03[8] |
| 亮度 | 3.1[8] L☉ |
| 溫度 | 4976[8] K |
| 金属量 [Fe/H] | −0.08[8] dex |
| 自轉速度 (v sin i) | 2.8[8] km/s |
| 年齡 | 10.2 (5.4–13.5)[8] Gyr |
| HD 115404 B | |
| 質量 | 0.542[9] M☉ |
| 半徑 | 0.550[9] R☉ |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | A |
| B | |
| ARICNS | A |
| B | |
HD 115404 是一個位於后髮座附近的雙星系統。依巴谷卫星進行的視差測量將系統置於 36 光年或 11 秒差距之外[11]。視星等分別為 6.66 和 9.50[2]。
主星A是一顆K型主序星[5]。它的質量大約是太陽的70%，半徑是太陽的0.76倍[8]。它的伴星是一顆紅矮星(M0.5 V)[12]。它的質量是太陽的54.2%，半徑是太陽的0.55 倍[9]。這兩顆恆星每770年繞軌道運行一次[7]。該系統被認為相當古老，有5.4到135億年的歷史[8]。
參考資料
- ^ 1.0 1.1 1.2 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 . 已忽略未知参数|collaboration=(帮助) Gaia DR3 record for this source at VizieR. - ^ 2.0 2.1 2.2 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. The Tycho double star catalogue. Astronomy and Astrophysics. 2002, 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822 .
- ^ 3.0 3.1 3.2 3.3 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 . 已忽略未知参数
|collaboration=(帮助) Gaia DR3 record for this source at VizieR. - ^ 4.0 4.1 Cowley, A. P.; Hiltner, W. A.; Witt, A. N. Spectral classification and photometry of high proper motion stars. The Astronomical Journal. 1967, 72: 1334. Bibcode:1967AJ.....72.1334C. doi:10.1086/110413.
- ^ 5.0 5.1 White, Russel J.; Gabor, Jared M.; Hillenbrand, Lynne A. High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun. The Astronomical Journal. 2007, 133 (6): 2524. Bibcode:2007AJ....133.2524W. S2CID 122854. arXiv:0706.0542 . doi:10.1086/514336.
- ^ Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups. Astronomy and Astrophysics. 2010, 521: A12. Bibcode:2010A&A...521A..12M. S2CID 119209183. arXiv:1007.1132 . doi:10.1051/0004-6361/201014948.
- ^ 7.0 7.1 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [11 August 2017]. （原始内容存档于2017-08-01）.
- ^ 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai. Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars. The Astrophysical Journal Supplement Series. 2016, 225 (2): 32. Bibcode:2016ApJS..225...32B. S2CID 118507965. arXiv:1606.07929 . doi:10.3847/0067-0049/225/2/32.
- ^ 9.0 9.1 9.2 Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berlind, Perry; Calkins, Michael L.; Mink, Jessica. The Hα emission of nearby M dwarfs and its relation to stellar rotation. The Astrophysical Journal. 2017, 834 (1): 85. Bibcode:2017ApJ...834...85N. S2CID 55000202. arXiv:1611.03509 . doi:10.3847/1538-4357/834/1/85.
- ^ [ HD 115404] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. - ^ van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2023-04-19]. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. （原始内容存档于2016-04-02）. Vizier catalog entry （页面存档备份，存于互联网档案馆）
- ^ Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. CARMENES input catalogue of M dwarfs (PDF). Astronomy & Astrophysics. 2015, 577: A128. S2CID 53135130. arXiv:1502.07580 . doi:10.1051/0004-6361/201525803. [失效連結]
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