仙王座 W

**仙王座 W**
觀測資料; 曆元 2000
星座	仙王座
星官
赤經	22h 36m 27.56359s
赤緯	+58° 25′ 33.9456″
視星等（V）	7.02 - 9.20
特性
光譜分類	K0ep-M2ep Ia + B0/B1
變星類型	SRc
天體測定
徑向速度 (Rv)	−44.64 km/s
自行 (μ)	赤經：−2.48 mas/yr ; 赤緯：−3.27 mas/yr
視差 (π)	0.02 ± 0.59 mas
距離	2,427 pc
絕對星等 (MV)	−7 + −3.5
詳細資料
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
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

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

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Fe_II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

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

^ ^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

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）

[hipparcos-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.

[gcvs-2] 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.

[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.

[famaey-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.

[wallerstein-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.

[stickland-6] Stickland, David J. IUE and stars with composite spectra. In ESA. 1988, 281. Bibcode:1988ESASP.281b..27S.

[garmany-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.

[polyakova-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.

[chandler-9] Chandler, S. C. Third catalogue of variable stars. Astronomical Journal. 1896, 16: 145. Bibcode:1896AJ.....16..145C. doi:10.1086/102484.

[merrill-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.

[bidelman-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.

[woolf-12] Woolf, N. J. Infrared emission from unusual binary stars. Astrophysical Journal. 1973, 185: 229. Bibcode:1973ApJ...185..229W. doi:10.1086/152411.

[wing-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.

[prieur-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.

[kiss-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.

[percy-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.

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觀測資料曆元 2000
星座	仙王座
星官
赤經	22^h 36^m 27.56359^s^[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 (R_v)	−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 (M_V)	−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
SIMBAD	資料