仙王座 W

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仙王座 W
觀測資料
曆元 2000
星座 仙王座
星官
赤經 22h 36m 27.56359s[1]
赤緯 +58° 25′ 33.9456″[1]
視星等(V) 7.02 - 9.20[2]
特性
光谱分类K0ep-M2ep Ia + B0/B1[2]
变星类型SRc[2]
天体测定
徑向速度 (Rv)−44.64[3] km/s
自行 (μ) 赤经:−2.48[1] mas/yr
赤纬:−3.27[1] mas/yr
视差 (π)0.02 ± 0.59[1] mas
距离2,427[4] pc
绝对星等 (MV)−7[5] + −3.5[6]
詳細資料 [7]
亮度72,400 L
溫度4,400 K
其他命名
W Cep, BD+57° 2568, HD 214369, HIP 111592, GSC 03995-00937, SAO 34614, PPM 40864, GC 31569, UCAC3 297-183471, IRAS 22345+5809, 2MASS J22362757+5825340, AAVSO 2232+57
參考資料庫
SIMBADdata

仙王座 W是位於仙王座這個星座的一顆光譜聯星變星。他被認為是仙王座 OB1星協的成員,距離我們大約8,000光年[4][8]

發現[编辑]

仙王座W是在1865年被報告為變星,它的變光範圍在7.3至8.3等[9]。它在1903年出版的波恩星表篇目為BD+57°2568,而在HD星表的序號是HD 214369。

在1925年,仙王座 W被列入Be星的表單中。它的光譜類型被認定為低溫的Mep [10]。依據1949年的頻譜,它被歸類為K0ep Ia,但也被認為有一顆小的高溫伴星,並加上不尋常的紅外過量[11][12]。研究來自伴星的紫外線光譜吸收線,它的光譜被歸類為B0-1[13]

系統[编辑]

仙王座 W的系統包括一顆K型超巨星與一顆光譜類型為早期B型的非超巨星伴星。這顆恆星有不尋常的發射線,包括由含有塵埃和電離氣體的星周包層產生的許可和禁制的FeII[5]。使用斑點干涉解析出兩顆成員相距0.262"[14]。已提出可能的軌道週期是2,090日[8]

變異性[编辑]

仙王座 W的亮度變化從7等至9等。變星總表將它列為半規則變星,試圖找出週期但是只顯示隨機的光度變化[15][16]

參考資料[编辑]

  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. arXiv:0708.1752. doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 Samus, N. N.; Durlevich, O. V.; 等. 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. 
  3. ^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters. Astronomy and Astrophysics. 2005, 430: 165. Bibcode:2005A&A...430..165F. arXiv:astro-ph/0409579. doi:10.1051/0004-6361:20041272. 
  4. ^ 4.0 4.1 >Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters. Astronomy and Astrophysics. 2005, 430: 165. Bibcode:2005A&A...430..165F. arXiv:astro-ph/0409579. doi:10.1051/0004-6361:20041272. 
  5. ^ 5.0 5.1 Wallerstein, George. On the Infrared Excess of W Cephei and Similar Stars. Astrophysical Journal. 1971, 166: 725. Bibcode:1971ApJ...166..725W. doi:10.1086/150996. 
  6. ^ Stickland, David J. IUE and stars with composite spectra. In ESA. 1988, 281. Bibcode:1988ESASP.281b..27S. 
  7. ^ Garmany, C. D.; Stencel, R. E. Galactic OB associations in the northern Milky Way Galaxy. I - Longitudes 55 deg to 150 deg. Astronomy and Astrophysics Supplement Series. 1992, 94: 211. Bibcode:1992A&AS...94..211G. 
  8. ^ 8.0 8.1 Polyakova, T. A. Variations in the brightness and polarization of W Cep. Astrophysics. 2006, 49 (2): 164. Bibcode:2006Ap.....49..164P. doi:10.1007/s10511-006-0017-z. 
  9. ^ Chandler, S. C. Third catalogue of variable stars. Astronomical Journal. 1896, 16: 145. Bibcode:1896AJ.....16..145C. doi:10.1086/102484. 
  10. ^ Merrill, P. W.; Humason, M. L.; Burwell, C. G. Discovery and Observations of Stars of Class Be. Astrophysical Journal. 1925, 61: 389. Bibcode:1925ApJ....61..389M. doi:10.1086/142899. 
  11. ^ Bidelman, William P. Catalogue and Bibliography of Emission-Line Stars of Types Later than B. Astrophysical Journal Supplement. 1954, 1: 175. Bibcode:1954ApJS....1..175B. doi:10.1086/190007. 
  12. ^ Woolf, N. J. Infrared emission from unusual binary stars. Astrophysical Journal. 1973, 185: 229. Bibcode:1973ApJ...185..229W. doi:10.1086/152411. 
  13. ^ Wing, R. F.; Carpenter, K. G. Notes on the early-type components of W Cep, O Cet, CH Cyg, AR Mon, and BL Tel. In NASA. Goddard Space Flight Center the Universe at Ultraviolet Wavelengths: the First Two Yrs. of Intern. Ultraviolet Explorer p 341-347 (SEE N81-25893 16-90). 1981, 2171. Bibcode:1981NASCP2171..341W. 
  14. ^ Prieur, J. L.; Aristidi, E.; Lopez, B.; Scardia, M.; Mignard, F.; Carbillet, M. High Angular Resolution Observations of Late-Type Stars. The Astrophysical Journal Supplement Series. 2002, 139: 249. Bibcode:2002ApJS..139..249P. doi:10.1086/338029. 
  15. ^ Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. Variability in red supergiant stars: Pulsations, long secondary periods and convection noise. Monthly Notices of the Royal Astronomical Society. 2006, 372 (4): 1721. Bibcode:2006MNRAS.372.1721K. arXiv:astro-ph/0608438. doi:10.1111/j.1365-2966.2006.10973.x. 
  16. ^ Percy, John R.; Sato, Hiromitsu. Long Secondary Periods in Pulsating Red Supergiant Stars. Journal of the Royal Astronomical Society of Canada. 2009, 103: 11. Bibcode:2009JRASC.103...11P. 

外部連結[编辑]

天球赤道座標星图 22h 36m 27.60s,+58°25′34.0″