仙王座 W

提示：此条目的主题不是仙王座VV。

仙王座 W是位于仙王座这个星座的一颗光谱联星和变星。他被认为是仙王座 OB1星协的成员，距离我们大约8,000光年^[4][8]。

仙王座 W

观测资料 历元 2000
星座	仙王座
星官
赤经	22h 36m 27.56359s[1]
赤纬	+58° 25′ 33.9456″[1]
视星等（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
径向速度 (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]
详细资料 [7]
亮度	72,400 L☉
温度	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
参考数据库
SIMBAD	资料

发现

仙王座W是在1865年被报告为变星，它的变光范围在7.3至8.3等^[9]。它在1903年出版的波恩星表篇目为BD+57°2568，而在HD星表的序号是HD 214369。

在1925年，仙王座 W被列入Be星的表单中。它的光谱类型被认定为低温的Mep ^[10]。依据1949年的频谱，它被归类为K0ep Ia，但也被认为有一颗小的高温伴星，并加上不寻常的红外过量^[11][12]。研究来自伴星的紫外线光谱吸收线，它的光谱被归类为B0-1^[13]。

系统

仙王座 W的系统包括一颗K型超巨星与一颗光谱类型为早期B型的非超巨星伴星。这颗恒星有不寻常的发射线，包括由含有尘埃和电离气体的星周包层产生的许可和禁制的Fe_II线^[5]。使用斑点干涉解析出两颗成员相距0.262"^[14]。已提出可能的轨道周期是2,090日^[8]。

变异性

仙王座 W的亮度变化从7等至9等。变星总表将它列为半规则变星，试图找出周期但是只显示随机的光度变化^[15][16]。

参考资料

1. 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. 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.
4. >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. 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. 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.

外部链接

• AAVSO chart of comparison stars for W Cephei（页面存档备份，存于互联网档案馆）
• British Astronomical Association VSS light curves（页面存档备份，存于互联网档案馆）