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 | |
| 光譜分類 | K0ep-M2ep Ia + B0/B1[2] |
| 變星類型 | SRc[2] |
| 天體測定 | |
| 徑向速度 (Rv) | −44.64[3] km/s |
| 自行 (μ) | 赤經：−2.48[1] mas/yr 赤緯：−3.27[1] mas/yr |
| 視差 (π) | 0.02 ± 0.59[1] mas |
| 距離 | 2,427[4] pc |
| 絕對星等 (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 | |
| 參考資料庫 | |
| SIMBAD | 資料 |
仙王座 W是位於仙王座這個星座的一顆光譜聯星和變星。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
[編輯]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
[編輯]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線[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
[編輯]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
[編輯]- ^ 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.
- ^ 2.0 2.1 2.2 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.
- ^ 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.
- ^ 4.0 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.
- ^ 5.0 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.
- ^ Stickland, David J. IUE and stars with composite spectra. In ESA. 1988, 281. Bibcode:1988ESASP.281b..27S.
- ^ 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.
- ^ 8.0 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.
- ^ Chandler, S. C. Third catalogue of variable stars. Astronomical Journal. 1896, 16: 145. Bibcode:1896AJ.....16..145C. doi:10.1086/102484.
- ^ 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.
- ^ 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.
- ^ Woolf, N. J. Infrared emission from unusual binary stars. Astrophysical Journal. 1973, 185: 229. Bibcode:1973ApJ...185..229W. doi:10.1086/152411.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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
[編輯]- AAVSO chart of comparison stars for W Cephei（頁面存檔備份，存於互聯網檔案館）
- British Astronomical Association VSS light curves（頁面存檔備份，存於互聯網檔案館）
