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**WR 137**
觀測資料; 曆元 J2000
星座	天鵝座
星官
赤經	20h 14m 31.76754s
赤緯	36° 39′ 39.6010″
視星等（V）	7.91 (7.86 - 7.93)
特性
演化阶段	沃夫-瑞葉
光谱分类	WC7pd + O9
U−B 色指数	−0.40
B−V 色指数	+0.29
变星类型	WR
天体测定
自行 (μ)	赤经：−2.722 mas/yr ; 赤纬：−5.663 mas/yr
视差 (π)	0.4442 ± 0.0296 mas
距离	7,300 ± 500 ly ; (2,300 ± 200 pc)
绝对星等 (MV)	−5.7 (−4.52 + −5.25)
	軌道
繞行週期 (P)	4,766 ± 66
半長軸 (a)	16 AU
偏心率 (e)	0.178 ± 0.042
倾斜角 (i)	67°
半振幅 (K1); (primary)	27.9 ± 1.2 km/s
半振幅 (K2); (secondary)	6.1 ± 1.3 km/s
詳細資料
WR
質量	4.4 ± 1.5 M☉
半徑	10 R☉
亮度	537,000 L☉
溫度	56,000 K
O
質量	20 ± 2 M☉
年齡	4.5 Myr
其他命名
	天鵝座V1679、WR 137、HD 191765、HIP 99769、BD+35°4001, Hen 3-1839
參考資料庫
SIMBAD	资料

WR 137位於天鵝座，是一顆距離地球大約6,000光年的沃爾夫-拉葉星變星。 WR 137與WR 134和WR 135是1867年在天鵝座觀測到的3顆光譜在連續的譜帶中有強烈的發射線，而不是常見的吸收線組成。它們是天文學家沃夫和瑞葉發現的第一批外觀不尋常，並以發現著的名字命名的沃爾夫-拉葉星^[9]。它是碳序列的沃夫-瑞葉星，表明缺乏氮的譜線而有強的碳發射譜線射。WR 137光譜的C_III發射比C_IV微弱，O_V也微弱，因此它的光譜型為WC7。它的頻譜還顯示He_{II和O_IV的譜線^[10]^[4]。}

WR 137是聯星系統，伴星O9的主序星或巨星。這兩顆星在一個相對扁平的橢圓軌道上互繞，軌道週期為13年。在近星點附近似乎產生了一個塵埃雲。軌道的傾斜度不確定，很可能在67°附近，氮一些分析的建議值在23°左右^[7]。O型星在視覺上更亮，質量也更大，但WR星主導了光譜，具有更高的輻射熱發光度（熱光度）。

WR 137距離WR135大約1度，兩者被認為都在天鵝座OB3星協內，且與地球有大致相同的距離^[11]。因為存在熱發光伴侶，使它的屬性不確定。組合光譜的偽擬合產生56,000K的溫度，光度為537,000 L_☉，半徑為10 R_☉。典型WC7型的半徑是4.5 R_☉，這意味著溫度要更熱^[7]。

參考資料

^ ^1.0 ^1.1 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.
^ ^2.0 ^2.1 ^2.2 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.
^ Alfonso-Garzón, J.; Domingo, A.; Mas-Hesse, J. M.; Giménez, A. The first INTEGRAL-OMC catalogue of optically variable sources. Astronomy & Astrophysics. 2012, 548: A79. Bibcode:2012A&A...548A..79A. arXiv:1210.0821 . doi:10.1051/0004-6361/201220095.
^ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 Sander, A.; Hamann, W.-R.; Todt, H. The Galactic WC stars. Stellar parameters from spectral analyses indicate a new evolutionary sequence. Astronomy & Astrophysics. 2012, 540: A144. Bibcode:2012A&A...540A.144S. arXiv:1201.6354 . doi:10.1051/0004-6361/201117830.
^ 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.
^ ^6.0 ^6.1 ^6.2 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
^ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 Lefèvre, L.; Marchenko, S. V.; Lépine, S.; Moffat, A. F. J.; Acker, A.; Harries, T. J.; Annuk, K.; Bohlender, D. A.; Demers, H.; Grosdidier, Y.; Hill, G. M.; Morrison, N. D.; Knauth, D. C.; Skalkowski, G.; Viti, S. Spectroscopic study of the long-period dust-producing WC7pd+O9 binary HD192641. Monthly Notices of the Royal Astronomical Society. 2005, 360: 141. Bibcode:2005MNRAS.360..141L. arXiv:astro-ph/0504475 . doi:10.1111/j.1365-2966.2005.09017.x.
^ Smith, L. F.; Meynet, G.; Mermilliod, J.-C. Improved bolometric corrections for WR stars from cluster membership and evolutionary models. Astronomy and Astrophysics. 1994, 287: 835. Bibcode:1994A&A...287..835S.
^ Murdin, P. Wolf, Charles J E (1827-1918). The Encyclopedia of Astronomy and Astrophysics. 2001: 4101. Bibcode:2000eaa..bookE4101.. ISBN 0333750888. doi:10.1888/0333750888/4101.
^ Hiltner, W. A.; Schild, R. E. Spectral Classification of Wolf-Rayet Stars. Astrophysical Journal. 1966, 143: 770. Bibcode:1966ApJ...143..770H. doi:10.1086/148556.
^ Gervais, Simon; St-Louis, Nicole. A Large H I Shell surrounding the Wolf-Rayet Star HD 191765. The Astronomical Journal. 1999, 118 (5): 2394. Bibcode:1999AJ....118.2394G. doi:10.1086/301065 .

外部連結

Wolf-Rayet shells （页面存档备份，存于互联网档案馆） showing a spectrum of WR 135
WR134 Ring Nebula （页面存档备份，存于互联网档案馆） with WR 135 visible in the top left corner

[hipparcos-1] 1.0 ^1.1 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.

[ducati-2] 2.0 ^2.1 ^2.2 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.

[omc-3] Alfonso-Garzón, J.; Domingo, A.; Mas-Hesse, J. M.; Giménez, A. The first INTEGRAL-OMC catalogue of optically variable sources. Astronomy & Astrophysics. 2012, 548: A79. Bibcode:2012A&A...548A..79A. arXiv:1210.0821 . doi:10.1051/0004-6361/201220095.

[sander-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 Sander, A.; Hamann, W.-R.; Todt, H. The Galactic WC stars. Stellar parameters from spectral analyses indicate a new evolutionary sequence. Astronomy & Astrophysics. 2012, 540: A144. Bibcode:2012A&A...540A.144S. arXiv:1201.6354 . doi:10.1051/0004-6361/201117830.

[gcvs-5] 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.

[dr2-6] 6.0 ^6.1 ^6.2 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录

[lefevre-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 Lefèvre, L.; Marchenko, S. V.; Lépine, S.; Moffat, A. F. J.; Acker, A.; Harries, T. J.; Annuk, K.; Bohlender, D. A.; Demers, H.; Grosdidier, Y.; Hill, G. M.; Morrison, N. D.; Knauth, D. C.; Skalkowski, G.; Viti, S. Spectroscopic study of the long-period dust-producing WC7pd+O9 binary HD192641. Monthly Notices of the Royal Astronomical Society. 2005, 360: 141. Bibcode:2005MNRAS.360..141L. arXiv:astro-ph/0504475 . doi:10.1111/j.1365-2966.2005.09017.x.

[smith-8] Smith, L. F.; Meynet, G.; Mermilliod, J.-C. Improved bolometric corrections for WR stars from cluster membership and evolutionary models. Astronomy and Astrophysics. 1994, 287: 835. Bibcode:1994A&A...287..835S.

[9] Murdin, P. Wolf, Charles J E (1827-1918). The Encyclopedia of Astronomy and Astrophysics. 2001: 4101. Bibcode:2000eaa..bookE4101.. ISBN 0333750888. doi:10.1888/0333750888/4101.

[10] Hiltner, W. A.; Schild, R. E. Spectral Classification of Wolf-Rayet Stars. Astrophysical Journal. 1966, 143: 770. Bibcode:1966ApJ...143..770H. doi:10.1086/148556.

[gervais-11] Gervais, Simon; St-Louis, Nicole. A Large H I Shell surrounding the Wolf-Rayet Star HD 191765. The Astronomical Journal. 1999, 118 (5): 2394. Bibcode:1999AJ....118.2394G. doi:10.1086/301065 .

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