天津增十九
天津增十九 (天鵝座52)是在北半球天鵝座的一顆巨星,視星等為4.22等。根據依巴谷衛星的視差,它的距離大約是291光年(89秒差距)遠。
观测数据 曆元 J2000 分點 J2000 | |
---|---|
星座 | 天鵝座 |
A | |
赤經 | 20h 45m 39.75304s[1] |
赤緯 | +30° 43′ 10.9756″[1] |
視星等 (V) | 4.22[2] |
B | |
赤經 | 20h 45m 40.206s[3] |
赤緯 | +30° 43′ 12.96″[3] |
視星等 (V) | 11.06[3] |
特性 | |
光谱分类 | G9.5III[4] |
U−B 色指数 | +0.88[2] |
B−V 色指数 | +1.05[2] |
天体测定 | |
徑向速度 (Rv) | –0.72[5] km/s |
自行 (μ) | 赤经:–8.98[1] mas/yr 赤纬:+24.11[1] mas/yr |
视差 (π) | 16.22 ± 0.19[1] mas |
距离 | 201 ± 2 ly (61.7 ± 0.7 pc) |
詳細資料 | |
質量 | 2.07[6] M☉ |
半徑 | 13.81[6] R☉ |
表面重力 (log g) | 2.5[7] |
亮度 | 89[7] L☉ |
溫度 | 4,677[7] K |
金属量 [Fe/H] | −0.24[7] dex |
自轉速度 (v sin i) | 3.7[7] km/s |
年齡 | 2.27[6] Gyr |
其他命名 | |
參考資料庫 | |
SIMBAD | A |
B |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/NGC6960_Veil_Nebula_Supernova_Remnant_from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg/220px-NGC6960_Veil_Nebula_Supernova_Remnant_from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg)
天津增十九很可能是水平分支上的紅團簇星,它的核心融合了氫,然而還有25%的可能性仍是紅巨星分支(RGB)上的恆星,氫融合只在核心周圍的氫殼層進行。如果是紅團簇星,它的年齡高達22.7億歲,但如果只是RGB星,則只有9.1億歲[6]。在4,677K的有效溫度下,它的光度大約是90 L☉[7],它的半徑大約是14 R☉[6]。
參考資料
编辑- ^ 1.0 1.1 1.2 1.3 1.4 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:10.1051/0004-6361:20078357Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 2.0 2.1 2.2 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data. SIMBAD, 1986, Bibcode:1986EgUBV........0M
- ^ 3.0 3.1 3.2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. The Tycho-2 catalogue of the 2.5 million brightest stars. Astronomy and Astrophysics. 2000, 355: L27. Bibcode:2000A&A...355L..27H.
- ^ 4.0 4.1 Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869. Bibcode:2008MNRAS.389..869E. S2CID 14878976. arXiv:0806.2878 . doi:10.1111/j.1365-2966.2008.13596.x.
- ^ Famaey, B.; et al, Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters, Astronomy and Astrophysics, January 2005, 430 (1): 165–186, Bibcode:2005A&A...430..165F, S2CID 17804304, arXiv:astro-ph/0409579 , doi:10.1051/0004-6361:20041272
- ^ 6.0 6.1 6.2 6.3 6.4 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas. Precise radial velocities of giant stars. Astronomy & Astrophysics. 2015, 574: A116. Bibcode:2015A&A...574A.116R. S2CID 59334290. arXiv:1412.4634 . doi:10.1051/0004-6361/201322360.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 Massarotti, Alessandro; et al, Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity, The Astronomical Journal, January 2008, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209