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天淵增二

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天淵增二(人馬座θ1
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
天淵增二的位置(紅圈)
觀測資料
曆元 J2000.0
星座 人馬座
星官
赤經 19h 59m 44.17834s[1]
赤緯 −35° 16′ 34.7049″[1]
視星等(V) 4.37[2]
特性
光譜分類B3 IVp[3]
U−B 色指數−0.67[2]
B−V 色指數−0.15[2]
天體測定
自行 (μ) 赤經:+5.60[1] mas/yr
赤緯:−25.81[1] mas/yr
視差 (π)6.29 ± 0.21[1] mas
距離520 ± 20 ly
(159 ± 5 pc)
絕對星等 (MV)−1.63[4]
軌道[5]
繞行週期 (P)2.1051 d
偏心率 (e)0.00
近心點 曆元 (T)2411140.645 JD
近心點幅角 (ω)
(secondary)
0.00°
半振幅 (K1)
(primary)
15.9 km/s
詳細資料
θ1 Sgr A
質量6.6±0.1[6] M
半徑5.6[7] R
亮度 (bolometric)2,271[8] L
溫度17,900[8] K
自轉速度 (v sin i)73[3] km/s
年齡32.8±5.0[6] Myr
其他命名
θ1 Sgr、​CD−35° 13831、​HD 189103、​HIP 98412、​HR 7623、​SAO 211716、​WDS J19597-3517[9]
參考資料庫
SIMBAD資料

天淵增二人馬座θ1黃道星座人馬座中一對很靠近的聯星系統[10]。它的視星等視肉眼可見的 +4.37等[2]。根據從地球測得年周視差6.29mas的數值[1],它與太陽的距離是520光年。在這個距離上,由於星際塵埃消光,它的星等減少了0.24等[11]

它是只有單一光譜線的光譜聯星,有著軌道週期正好2.1天的圓形的軌道[5]。可見的主星A是B型次巨星光譜類型是B3IVp[3],年齡大約3,300萬,投影自轉速度為每秒73公里[3]。主星的質量是太陽的6.6倍[6],半徑是太陽的5.6倍 [7]。來自有效溫度17,900K[8]光球層輻射的量是太陽光度的2,271倍[8]

參考資料

  1. ^ 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, arXiv:0708.1752可免費查閱, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 Nicolet, B., Photoelectric photometric Catalogue of homogeneous measurements in the UBV System, Astronomy and Astrophysics Supplement Series, 1978, 34: 1–49, Bibcode:1978A&AS...34....1N. 
  3. ^ 3.0 3.1 3.2 3.3 Levato, H., Rotational velocities and spectral types for a sample of binary systems, Astronomy and Astrophysics, 1975, 19: 91, Bibcode:1975A&AS...19...91L 
  4. ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971可免費查閱, doi:10.1134/S1063773712050015. 
  5. ^ 5.0 5.1 Pourbaix, D.; et al, SB9: The ninth catalogue of spectroscopic binary orbits, Astronomy and Astrophysics, 2004, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573可免費查閱, doi:10.1051/0004-6361:20041213. 
  6. ^ 6.0 6.1 6.2 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883可免費查閱, doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ 7.0 7.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS), Astronomy and Astrophysics Third, February 2001, 367: 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289可免費查閱, doi:10.1051/0004-6361:20000451. 
  8. ^ 8.0 8.1 8.2 8.3 Hohle, M. M.; et al, Masses and luminosities of O- and B-type stars and red supergiants, Astronomische Nachrichten, 2010, 331 (4): 349, Bibcode:2010AN....331..349H, arXiv:1003.2335可免費查閱, doi:10.1002/asna.200911355. 
  9. ^ tet01 Sgr. SIMBAD. 斯特拉斯堡天文資料中心. [2017-07-07]. 
  10. ^ 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, arXiv:0806.2878可免費查閱, doi:10.1111/j.1365-2966.2008.13596.x. 
  11. ^ Gontcharov, G. A., Spatial distribution and kinematics of OB stars, Astronomy Letters, November 2012, 38 (11): 694–706, Bibcode:2012AstL...38..694G, arXiv:1606.09028可免費查閱, doi:10.1134/S1063773712110035.