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**BD+60°2522**
	; SAO 20575與環繞於周圍的星雲NGC 7635; Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
觀測資料; 曆元 J2000
星座	仙后座
星官
赤經	23h 20m 44.5203s
赤緯	+61° 11′ 40.561″
視星等（V）	8.67
特性
光谱分类	O6.5(f)(n)p
U−B 色指数	−0.62
B−V 色指数	+0.41
天体测定
徑向速度 (Rv)	−26 km/s
自行 (μ)	赤经：3.10 mas/yr ; 赤纬：4.60 mas/yr
视差 (π)	13.0 ± 8.0 mas
距离	2,400 pc
绝对星等 (MV)	−5.5
詳細資料
質量	44 M☉
半徑	15 R☉
亮度	398,000 L☉
溫度	37,500 K
自轉速度 (v sin i)	178 - 240 km/s
年齡	2 Myr
其他命名
	SAO 20575 IRAS 23185+6055 2MASS J23204452+6111404
參考資料庫
SIMBAD	资料

SAO 20575，即BD+60°2522，是在天球上位於仙后座的一顆明亮O型恆星，周圍是由恆星本身恆星風形成的氣泡星雲（NGC 7635）。該恆星的詳細光譜類型仍不明，並且在恆星外觀與該恆星對鄰近星雲造成的影響之間有許多光譜特徵和兩者之間的不一致，但它無疑是一顆高光度的大質量恆星^[6]。對該恆星直接進行光譜觀測的結果顯示它是O6.5型恆星，表面有效溫度37,500K。SAO 20575是銀河系英仙臂內距離地球約8500光年的仙后座OB2星協的成員恆星^[8]^[9]。

雖然SAO 20575的年齡約2百萬年，周圍的星雲年齡只有約4萬年。星雲的氣泡狀結構被認為是恆星風在超音速狀態下撞擊星際物質所產生的震波而形成。SAO 20575的恆星風速度高達1,800–2,500 km/s，使其每年損失的質量達到太陽的百萬分之一^[8]。

參考資料

^ ^1.0 ^1.1 ^1.2 ^1.3 Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. The TYCHO Reference Catalogue. Astronomy and Astrophysics. 1998, 335: L65. Bibcode:1998A&A...335L..65H.
^ ^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.
^ Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; St-Louis, Nicole; Fariña, Cecilia; Bosch, Guillermo L.; Morrell, Nidia I.; Barbá, Rodolfo H.; Van Loon, Jacco Th. The Onfp Class in the Magellanic Clouds. The Astronomical Journal. 2010, 139 (3): 1283. Bibcode:2010AJ....139.1283W. arXiv:1001.4032 . doi:10.1088/0004-6256/139/3/1283.
^ Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. 1953. Bibcode:1953GCRV..C......0W. LCCN 54001336.
^ Jenkins, Louise F. General Catalogue of Trigonometric Stellar Parallaxes. Yale University Observatory. 1952. Bibcode:1952gcsr.book.....J. LCCN 53001043.
^ ^6.0 ^6.1 ^6.2 Moore, B. D.; Walter, D. K.; Hester, J. J.; Scowen, P. A.; Dufour, R. J.; Buckalew, B. A. Hubble Space Telescope Observations of the Windblown Nebula NGC 7635. The Astronomical Journal. 2002, 124 (6): 3313. Bibcode:2002AJ....124.3313M. doi:10.1086/344596.
^ Rauw, G.; De Becker, M.; Vreux, J. -M. Line profile variability in the spectra of Oef stars. Astronomy and Astrophysics. 2003, 399: 287. Bibcode:2003A&A...399..287R. arXiv:astro-ph/0408253 . doi:10.1051/0004-6361:20021776.
^ ^8.0 ^8.1 ^8.2 Anand, M. Y.; Kagali, B. A.; Murthy, Jayant. Study of Bubble nebula using IUE high resolution spectra. Bulletin of the Astronomical Society of India. 2009, 37: 1. Bibcode:2009BASI...37....1A. arXiv:0903.2828 .
^ Mason, Brian D.; Hartkopf, William I.; Gies, Douglas R.; Henry, Todd J.; Helsel, John W. The High Angular Resolution Multiplicity of Massive Stars. The Astronomical Journal. 2009, 137 (2): 3358. Bibcode:2009AJ....137.3358M. arXiv:0811.0492 . doi:10.1088/0004-6256/137/2/3358.

[tycho-1] 1.0 ^1.1 ^1.2 ^1.3 Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. The TYCHO Reference Catalogue. Astronomy and Astrophysics. 1998, 335: L65. Bibcode:1998A&A...335L..65H.

[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.

[ofnp-3] Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; St-Louis, Nicole; Fariña, Cecilia; Bosch, Guillermo L.; Morrell, Nidia I.; Barbá, Rodolfo H.; Van Loon, Jacco Th. The Onfp Class in the Magellanic Clouds. The Astronomical Journal. 2010, 139 (3): 1283. Bibcode:2010AJ....139.1283W. arXiv:1001.4032 . doi:10.1088/0004-6256/139/3/1283.

[4] Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. 1953. Bibcode:1953GCRV..C......0W. LCCN 54001336.

[5] Jenkins, Louise F. General Catalogue of Trigonometric Stellar Parallaxes. Yale University Observatory. 1952. Bibcode:1952gcsr.book.....J. LCCN 53001043.

[moore-6] 6.0 ^6.1 ^6.2 Moore, B. D.; Walter, D. K.; Hester, J. J.; Scowen, P. A.; Dufour, R. J.; Buckalew, B. A. Hubble Space Telescope Observations of the Windblown Nebula NGC 7635. The Astronomical Journal. 2002, 124 (6): 3313. Bibcode:2002AJ....124.3313M. doi:10.1086/344596.

[rauw-7] Rauw, G.; De Becker, M.; Vreux, J. -M. Line profile variability in the spectra of Oef stars. Astronomy and Astrophysics. 2003, 399: 287. Bibcode:2003A&A...399..287R. arXiv:astro-ph/0408253 . doi:10.1051/0004-6361:20021776.

[anand-8] 8.0 ^8.1 ^8.2 Anand, M. Y.; Kagali, B. A.; Murthy, Jayant. Study of Bubble nebula using IUE high resolution spectra. Bulletin of the Astronomical Society of India. 2009, 37: 1. Bibcode:2009BASI...37....1A. arXiv:0903.2828 .

[9] Mason, Brian D.; Hartkopf, William I.; Gies, Douglas R.; Henry, Todd J.; Helsel, John W. The High Angular Resolution Multiplicity of Massive Stars. The Astronomical Journal. 2009, 137 (2): 3358. Bibcode:2009AJ....137.3358M. arXiv:0811.0492 . doi:10.1088/0004-6256/137/2/3358.

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