軫宿三

**轸宿三**
	轸宿三的位置 (红圈处)
觀測資料; 曆元 J2000.0
星座	烏鴉座
星官	轸 (星官)
赤經	12h 29m 52s
赤緯	-16° 30′ 55.5″
視星等（V）	+2.96
特性
光谱分类	A0V
U−B 色指数	-0.05
B−V 色指数	-0.05
天体测定
徑向速度 (Rv)	+9 km/s
自行 (μ)	赤经：−210.49 mas/yr ; 赤纬：−138.74 mas/yr
视差 (π)	37.55 ± 0.16 mas
距离	86.9 ± 0.4 ly ; (26.6 ± 0.1 pc)
绝对星等 (MV)	+0.83
詳細資料
質量	2.5 M☉
亮度	60 L☉
溫度	10400 K
自轉速度 (v sin i)	236 km/s
年齡	260+14; −24×106 or 3.2+0.1; −0.1×106 年
其他命名
	7 Crv, BD−15 3482, FK5 465, HD 108767, HIP 60965, HR 4757, SAO 157323.
參考資料庫
SIMBAD	资料

軫（zhěn）宿（xiù）三（δ Crv/烏鴉座δ），其英文傳統名稱為Algorab，^[2]是一顆位于南天星座烏鴉座的恆星三等星，距离太阳87光年^[3]。

恒星特性

轸宿三有2.5倍太阳质量，造成它的光度比太阳高的多，约是60倍太阳光度。表面温度10,400K，散发出白色的光芒。^[4]它的恒星分类为A0V-IV^[5]，但是它的光度比主序星还要高一些。因此它可能是个年龄2.6亿的次巨星，已经快要耗尽核心的氢并且正在演化离主序带，或是320万年的前主序星，还没有完全凝聚并且在主序带上稳定下来。^[6]

1823年，英国天文学家James South和约翰·赫歇尔发现轸宿三是一个双星。从那时起，两星的相对位置都没有改变。^[7]9.3等的伴星，HR 4757 B，恒星分类K2Ve，角距离24.2弧秒，位置角214°。^[7]^[8]虽然两星有相同的自行，年龄的明显差距代表它们可能不是有物理关联的。^[6]

2006年的研究发现轸宿三没有代表星周物质存在红外线超量，^[9]但是更热的星际尘埃在2014年的一个研究被检测到。^[10]

参考

^ Kaler, James B. ALGORAB (Delta Corvi). Stars. University of Illinois. [2010-02-24]. （原始内容存档于2020-07-28）.
^ IAU Catalog of Star Names. [28 July 2016]. （原始内容存档于2018-07-07）.
^ van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752  , doi:10.1051/0004-6361:20078357
^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始内容存档于2012-03-10）
^ Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770  , doi:10.1086/504637
^ ^6.0 ^6.1 Montesinos, B.; et al, Parameters of Herbig Ae/Be and Vega-type stars, Astronomy and Astrophysics, March 2009, 495 (3): 901–917, Bibcode:2009A&A...495..901M, arXiv:0811.3557  , doi:10.1051/0004-6361:200810623
^ ^7.0 ^7.1 Garfinkle, Robert A., Star-Hopping: Your Visa to Viewing the Universe, Cambridge University Press: 109, 1997, ISBN 0-521-59889-3
^ Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878  , doi:10.1111/j.1365-2966.2008.13596.x
^ Su, K. Y. L.; et al, Debris Disk Evolution around A Stars, The Astrophysical Journal, December 2006, 653 (1): 675–689, Bibcode:2006ApJ...653..675S, arXiv:astro-ph/0608563  , doi:10.1086/508649
^ Ertel, S.; Absil, O.; Defrère, D.; Le Bouquin, J.-B.; Augereau, J.-C.; Marion, L.; Blind, N.; Bonsor, A.; Bryden, G.; Lebreton, J.; Milli, J. A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER. Astronomy & Astrophysics. 2014, 570: 20. Bibcode:2014A&A...570A.128E. arXiv:1409.6143  . doi:10.1051/0004-6361/201424438. A128.

[kaler-1] Kaler, James B. ALGORAB (Delta Corvi). Stars. University of Illinois. [2010-02-24]. （原始内容存档于2020-07-28）.

[IAU-CSN-2] IAU Catalog of Star Names. [28 July 2016]. （原始内容存档于2018-07-07）.

[aaa474_2_653-3] van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752  , doi:10.1051/0004-6361:20078357

[csiro-4] The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], （原始内容存档于2012-03-10）

[aj132_1_161-5] Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770  , doi:10.1086/504637

[aaa495_3_901-6] 6.0 ^6.1 Montesinos, B.; et al, Parameters of Herbig Ae/Be and Vega-type stars, Astronomy and Astrophysics, March 2009, 495 (3): 901–917, Bibcode:2009A&A...495..901M, arXiv:0811.3557  , doi:10.1051/0004-6361:200810623

[garfinkle1997-7] 7.0 ^7.1 Garfinkle, Robert A., Star-Hopping: Your Visa to Viewing the Universe, Cambridge University Press: 109, 1997, ISBN 0-521-59889-3

[mnras389_2_869-8] Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878  , doi:10.1111/j.1365-2966.2008.13596.x

[apj653_1_675-9] Su, K. Y. L.; et al, Debris Disk Evolution around A Stars, The Astrophysical Journal, December 2006, 653 (1): 675–689, Bibcode:2006ApJ...653..675S, arXiv:astro-ph/0608563  , doi:10.1086/508649

[Ertel-10] Ertel, S.; Absil, O.; Defrère, D.; Le Bouquin, J.-B.; Augereau, J.-C.; Marion, L.; Blind, N.; Bonsor, A.; Bryden, G.; Lebreton, J.; Milli, J. A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER. Astronomy & Astrophysics. 2014, 570: 20. Bibcode:2014A&A...570A.128E. arXiv:1409.6143  . doi:10.1051/0004-6361/201424438. A128.

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