WR 136

**WR 136**
	; 根據"TESS"的數據繪製的天鵝座V1770的光變曲線。
觀測資料; 曆元 J2000
星座	天鵝座
星官
赤經	20h 12m 06.5421s
赤緯	+38° 21′ 17.779″
視星等（V）	7.50
特性
光谱分类	WN6(h)-s
U−B 色指数	-0.37
B−V 色指数	0.01
天体测定
徑向速度 (Rv)	−21.6 km/s
自行 (μ)	赤经：−7.54 mas/yr ; 赤纬：−7.38 mas/yr
视差 (π)	0.4865 ± 0.0337 mas
距离	6,700 ± 500 ly ; (2,100 ± 100 pc)
绝对星等 (MV)	−5.63
詳細資料
質量	21 M☉
半徑	5.10 R☉
亮度	600,000 L☉
溫度	70,800 K
自轉	37
年齡	4.7 Myr
其他命名
	V1770 Cyg、AG+38 1977、 GSC 03151-01765、BD+37 3821、HD 192163、HIP 99546、GC 28056、SAO 69592.
參考資料庫
SIMBAD	资料

WR 136是位於天鵝座的一顆沃夫–瑞葉星。它位於眉月星雲的中心。據估計，它的年齡約為470萬年，已經接近生命的盡頭。預計在幾十萬年內，它將爆炸成為超新星^[8]。

根據最近的估計，WR 136比太陽亮60萬倍，質量大21倍，直徑大5.1倍。它的表面溫度約為70,000k^[4]。

WR 136在大約120,000–240,000年前成為紅超巨星時，吹掉了一個質量約為5 M_☉的物質外殼，並且仍在以80公里/秒的速度膨脹^[9]。現時，它的快速恆星風以約380萬英里/小時（1700公里/秒）的速度從恆星噴出^[10]，正在追趕早先從恆星噴出的物質，並將其塑造成一個外殼。從WR 136炙熱表面發射的紫外線使外殼發光^[9]。

有一些證據表明WR 136可能是一對聯星。它的伴星是一顆恆星分類 K或M的低質量恆星，每5.13天繞沃夫–瑞葉星一周，是低質量X射線聯星系統的前身^[11]。

參考資料

^ MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021].
^ ^2.0 ^2.1 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.
^ ^3.0 ^3.1 ^3.2 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: 0. Bibcode:2002yCat.2237....0D.
^ ^4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 ^4.6 Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J.; Oskinova, L. M. The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters. Astronomy & Astrophysics. 2019, A57: 625. Bibcode:2019A&A...625A..57H. S2CID 104292503. arXiv:1904.04687 . doi:10.1051/0004-6361/201834850.
^ Barbier-Brossat, M.; Petit, M.; Figon, P. Third bibliographic catalogue of stellar radial velocities (Text in French). Astronomy and Astrophysics Supplement Series. 1994, 108: 603. Bibcode:1994A&AS..108..603B.
^ ^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
^ Gräfener, G.; Vink, J. S.; Harries, T. J.; Langer, N. Rotating Wolf-Rayet stars in a post RSG/LBV phase. Astronomy & Astrophysics. 2012, 547: A83. Bibcode:2012A&A...547A..83G. S2CID 55530420. arXiv:1210.1153 . doi:10.1051/0004-6361/201118664.
^ ^8.0 ^8.1 Moore, Brian D.; Hester, J. Jeff; Scowen, Paul A. Hubble Space Telescope Observations of the Wolf-Rayet Nebula NGC 6888. The Astronomical Journal. 2000, 119 (6): 2991. Bibcode:2000AJ....119.2991M. S2CID 17769849. arXiv:astro-ph/0003053 . doi:10.1086/301389.
^ ^9.0 ^9.1 Mesa-Delgado, A.; Esteban, C.; García-Rojas, J.; Reyes-Pérez, J.; Morisset, C.; Bresolin, F. The Trace of the CNO Cycle in the Ring Nebula NGC 6888. The Astrophysical Journal. 2014, 785 (2): 100. Bibcode:2014ApJ...785..100M. S2CID 118596124. arXiv:1402.6181 . doi:10.1088/0004-637X/785/2/100.
^ Hamann, W.-R.; Wessolowski, U.; Koesterke, L. Non-LTE spectral analyses of Wolf-Rayet stars: The nitrogen spectrum of the WN6 prototype HD 192163 (WR136). Astronomy and Astrophysics. 1994, 281: 184. Bibcode:1994A&A...281..184H. ISSN 0004-6361.
^ Rustamov, D. N.; Cherepashchuk, A. M. The Wolf-Rayet star HD 192163 as a possible evolutionary progenitor of a low-mass X-ray binary. Astronomy Reports. 2011, 55 (4): 347–358 [17 July 2013]. Bibcode:2011ARep...55..347R. S2CID 121379439. doi:10.1134/S1063772911010069.

進階讀物

Bychkov, K. V.; Sitnik, T. G. Stratification of optical emission from NGC 6888 as a trace of the interaction between Wolf-Rayet stellar wind and the shell of a red supergiant. Astronomy Letters. 2006, 32 (6): 406. Bibcode:2006AstL...32..406B. S2CID 123039046. doi:10.1134/S1063773706060041.

外部連結

[MAST-1] MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021].

[hipparcos-2] 2.0 ^2.1 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357.

[ducati-3] 3.0 ^3.1 ^3.2 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: 0. Bibcode:2002yCat.2237....0D.

[hamann-4] 4.0 ^4.1 ^4.2 ^4.3 ^4.4 ^4.5 ^4.6 Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J.; Oskinova, L. M. The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters. Astronomy & Astrophysics. 2019, A57: 625. Bibcode:2019A&A...625A..57H. S2CID 104292503. arXiv:1904.04687 . doi:10.1051/0004-6361/201834850.

[5] Barbier-Brossat, M.; Petit, M.; Figon, P. Third bibliographic catalogue of stellar radial velocities (Text in French). Astronomy and Astrophysics Supplement Series. 1994, 108: 603. Bibcode:1994A&AS..108..603B.

[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

[grafener-7] Gräfener, G.; Vink, J. S.; Harries, T. J.; Langer, N. Rotating Wolf-Rayet stars in a post RSG/LBV phase. Astronomy & Astrophysics. 2012, 547: A83. Bibcode:2012A&A...547A..83G. S2CID 55530420. arXiv:1210.1153 . doi:10.1051/0004-6361/201118664.

[moore-8] 8.0 ^8.1 Moore, Brian D.; Hester, J. Jeff; Scowen, Paul A. Hubble Space Telescope Observations of the Wolf-Rayet Nebula NGC 6888. The Astronomical Journal. 2000, 119 (6): 2991. Bibcode:2000AJ....119.2991M. S2CID 17769849. arXiv:astro-ph/0003053 . doi:10.1086/301389.

[ngc6888-9] 9.0 ^9.1 Mesa-Delgado, A.; Esteban, C.; García-Rojas, J.; Reyes-Pérez, J.; Morisset, C.; Bresolin, F. The Trace of the CNO Cycle in the Ring Nebula NGC 6888. The Astrophysical Journal. 2014, 785 (2): 100. Bibcode:2014ApJ...785..100M. S2CID 118596124. arXiv:1402.6181 . doi:10.1088/0004-637X/785/2/100.

[10] Hamann, W.-R.; Wessolowski, U.; Koesterke, L. Non-LTE spectral analyses of Wolf-Rayet stars: The nitrogen spectrum of the WN6 prototype HD 192163 (WR136). Astronomy and Astrophysics. 1994, 281: 184. Bibcode:1994A&A...281..184H. ISSN 0004-6361.

[lmxb-11] Rustamov, D. N.; Cherepashchuk, A. M. The Wolf-Rayet star HD 192163 as a possible evolutionary progenitor of a low-mass X-ray binary. Astronomy Reports. 2011, 55 (4): 347–358 [17 July 2013]. Bibcode:2011ARep...55..347R. S2CID 121379439. doi:10.1134/S1063772911010069.

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觀測資料曆元 J2000
根據"TESS"的數據繪製的天鵝座V1770的光變曲線^[1]。
星座	天鵝座
星官
赤經	20^h 12^m 06.5421^s^[2]
赤緯	+38° 21′ 17.779″^[2]
視星等（V）	7.50^[3]
特性
光谱分类	WN6(h)-s^[4]
U−B 色指数	-0.37^[3]
B−V 色指数	0.01^[3]
天体测定

徑向速度 (R_v)	−21.6^[5] km/s
自行 (μ)	赤经：−7.54^[6] mas/yr 赤纬：−7.38^[6] mas/yr
视差 (π)	0.4865 ± 0.0337^[6] mas
距离	6,700 ± 500 ly (2,100 ± 100 pc)
绝对星等 (M_V)	−5.63^[4]

詳細資料

質量	21^[4] M_☉
半徑	5.10^[4] R_☉
亮度	600,000^[4] L_☉
溫度	70,800^[4] K
自轉	37^[7]
年齡	4.7^[8] Myr

其他命名
V1770 Cyg、AG+38 1977、 GSC 03151-01765、BD+37 3821、HD 192163、HIP 99546、GC 28056、SAO 69592.
參考資料庫
SIMBAD	资料