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蝘蜓座DI

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顯示被雲氣環繞的蝘蜓座DI A和B的影像。
事實上,每一個都是更接近的聯星。
觀測資料
曆元 J2000
星座 蝘蜓座
星官
赤經 11h 07m 20.72163s[1]
赤緯 −77° 38′ 07.2903″[1]
視星等(V) 10.655[2]
特性
光譜分類G0e[3]
U−B 色指數+0.630[2]
B−V 色指數+1.144[2]
變星類型金牛座T[4]
天體測定
自行 (μ) 赤經:−24.61[1] mas/yr
赤緯:3.45[1] mas/yr
視差 (π)4.49 ± 1.59[1] mas
距離approx. 700 ly
(approx. 220 pc)
詳細資料 [5]
Aa
質量1.7 M
半徑2.00 R
亮度4.7 L
溫度6,030 K
年齡7.1 Myr
Ba/Bb
質量0.18 M
半徑1.13 R
亮度0.11 L
溫度3,130 K
年齡3.0 Myr
其他命名
DI Cha、HIP 54365、 CD−76°486、WDS J11073-7738、 美國變星觀測者協會 1104-77
參考資料庫
SIMBAD資料

蝘蜓座DI,也稱為Hen 3-593或HIP 54365,是在蝘蜓座的一個四重星恆星系統。這個系統與地球的距離大約是700光年

蝘蜓座DI是一顆金牛座T型變星,是正接近主序帶初期恆星體。它的視星等不穩定,在10.65 和10.74等之間變化著[4]。儘管它在視覺上很黯淡,但它之所以被注意到,是因為它的光譜中有明顯的發射[6]

在1977年,蝘蜓座DI被發現有一個更微弱的同伴[7]。後來測得的分離距離為4.6",大約644AU[8]。伴星B被發現是一對相距僅0.066"(約10AU)的恆星[9],這兩顆恆星的光譜類型都是M5.5 [10]。最後,人們發現這顆變得主星有一個距離0.2"(約30AU)的微弱伴星,光譜類型為M6[10]

參考資料

[編輯]
  1. ^ 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可免費查閱. doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 Kilkenny, D.; Whittet, D. C. B.; Davies, J. K.; Evans, A.; Bode, M. F.; Robson, E. I.; Banfield, R. M. Optical and infrared photometry of southern early-type shell stars and pre-main-sequence variables. In Its South African Astronomical Observatory Circular No. 9 P 55-86 (SEE N86-18271 08-89). 1985, 9: 55. Bibcode:1985SAAOC...9...55K. 
  3. ^ Torres, C. A. O.; Quast, G. R.; Da Silva, L.; de la Reza, R.; Melo, C. H. F.; Sterzik, M. Search for associations containing young stars (SACY). I. Sample and searching method. Astronomy and Astrophysics. 2006, 460 (3): 695. Bibcode:2006A&A...460..695T. S2CID 16080025. arXiv:astro-ph/0609258可免費查閱. doi:10.1051/0004-6361:20065602. 
  4. ^ 4.0 4.1 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S. 
  5. ^ Daemgen, S.; Petr-Gotzens, M. G.; Correia, S.; Teixeira, P. S.; Brandner, W.; Kley, W.; Zinnecker, H. Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I. Astronomy & Astrophysics. 2013, 554: A43. Bibcode:2013A&A...554A..43D. S2CID 59440639. arXiv:1304.1150可免費查閱. doi:10.1051/0004-6361/201321220. 
  6. ^ Henize, Karl G. Emission-Line Stars in an Obscured Region in Chamaeleon. Astronomical Journal. 1963, 68: 280. Bibcode:1963AJ.....68S.280H. doi:10.1086/109141. 
  7. ^ Schwartz, R. D. A survey of southern dark clouds for Herbig-Haro objects and H-alpha emission stars. Astrophysical Journal Supplement Series. 1977, 35: 161. Bibcode:1977ApJS...35..161S. doi:10.1086/190473. 
  8. ^ Reipurth, Bo; Zinnecker, Hans. Visual binaries among pre-main sequence stars. Astronomy and Astrophysics. 1993, 278: 81. Bibcode:1993A&A...278...81R. 
  9. ^ Lafrenière, David; Jayawardhana, Ray; Brandeker, Alexis; Ahmic, Mirza; Van Kerkwijk, Marten H. A Multiplicity Census of Young Stars in Chamaeleon I. The Astrophysical Journal. 2008, 683 (2): 844–861. Bibcode:2008ApJ...683..844L. S2CID 2998049. arXiv:0803.0561可免費查閱. doi:10.1086/590239. 
  10. ^ 10.0 10.1 Schmidt, T. O. B.; Vogt, N.; Neuhäuser, R.; Bedalov, A.; Roell, T. New companions in the stellar systems of DI Cha, Sz 22, CHXR 32, and Cha Hα 5 in the Chamaeleon I star-forming region. Astronomy & Astrophysics. 2013, 557: A80. Bibcode:2013A&A...557A..80S. S2CID 67802847. arXiv:1307.1082可免費查閱. doi:10.1051/0004-6361/201220660.