zh %E7%99%BD%E7%BE%8A%E5%BA%A7UX

**白羊座UX**
	; 改編自烏爾沃斯（Ulvås）和亨利（2003年）的白羊座UX在可見光的光變曲線。
觀測資料; 曆元 J2000
星座	白羊座
星官
赤經	03h 26m 35.37568s
赤緯	+28° 42′ 54.2264″
視星等（V）	6.35 - 6.71
特性
光谱分类	G5IV
U−B 色指数	0.43
B−V 色指数	0.90
变星类型	RS CVn
天体测定
徑向速度 (Rv)	+26.53 km/s
自行 (μ)	赤经：+46.794 mas/yr ; 赤纬：−102.876 mas/yr
视差 (π)	19.7836 ± 0.1264 mas
距离	165 ± 1 ly ; (50.5 ± 0.3 pc)
绝对星等 (MV)	2.91
	軌道
主星	Aa
伴星	Ab
繞行週期 (P)	6.437888±0.000007 d
半長軸 (a)	1.750±0.01 mas
偏心率 (e)	0 (fixed)
倾斜角 (i)	125.0±0.5°
升交点黃經 (Ω)	113.4±0.4°
近心点曆元 (T)	2456238.134 ± 0.002 HJD
近心點幅角 (ω); (secondary)	90（確定的）°
	軌道
主星	A
伴星	B
繞行週期 (P)	111.02 yr
半長軸 (a)	648.0±0.8 mas
偏心率 (e)	0.77±0.01
倾斜角 (i)	93.3±0.6°
升交点黃經 (Ω)	58.9±0.5°
近心点曆元 (T)	2451664.9±34.3 HJD
近心點幅角 (ω); (secondary)	274.9±0.8°
詳細資料
白羊座UX Aa
質量	1.30±0.06 M☉
半徑	5.6±0.1 R☉
表面重力 (log g)	3.06±0.04
亮度	9.3±0.7 L☉
溫度	4,560±100 K
自轉	6.44 d
白羊座UX Ab
質量	1.14±0.06 M☉
半徑	1.6±0.2 R☉
表面重力 (log g)	4.09±0.16
亮度	2.34±0.28 L☉
溫度	5,670±100 K
白羊座UX B
質量	0.75 M☉
半徑	0.8±0.1 R☉
表面重力 (log g)	4.51±0.13
亮度	0.38±0.08 L☉
溫度	4,930±100 K
其他命名
	BD+28°532、CCDM 03266+2843、 HD 21242、HIP 16042、SAO 75927
參考資料庫
SIMBAD	资料
ARICNS	资料

白羊座UX是在北天的黃道星座白羊座的一個三合星系統。基於來自蓋亞衛星的視差測量，它距離太陽系大約165光年。主星，白羊座UX Aa，是一顆RS CVn型變星。這顆恆星的光度變化被認為是由於冷星斑和溫暖的耀斑組合，與恆星大氣層的基態溫度相對照。這種變化似乎是週期性，週期為8-9年^[6]。這顆恆星的亮度從視星等6.35到6.71不等，這意味著在理想的黑暗天空條件下，肉眼可能會間歇性地看到它^[3]。

一顆更遠的伴星，成員C，有著共同自行，並且處於相同的距離上^[11]。它是另一顆冷矮星，估計光譜等級為K2。任何一種估計的軌道都超過10萬年^[12]。

參考資料

^ Ulvås, V. Aarum; Henry, G. W. BV photometry of UX Ari in the period 1987–2002. Astronomy & Astrophysics. May 2003, 402 (3): 1033–1041. Bibcode:2003A&A...402.1033A. doi:10.1051/0004-6361:20030304 .
^ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ ^3.0 ^3.1 UX Ari. The International Variable Star Index. AAVSO. [28 October 2021]. （原始内容存档于2021-10-29）.
^ ^4.0 ^4.1 Strassmeier, Klaus G. Starspots. The Astronomy and Astrophysics Review. September 2009, 17 (3): 251–308. Bibcode:2009A&ARv..17..251S. doi:10.1007/s00159-009-0020-6 .
^ ^5.0 ^5.1 Guetter, H. H.; Hewitt, A. V. Photoelectric UBV photometry for 317 PZT and VZT stars. Publications of the Astronomical Society of the Pacific. June 1984, 96: 441–443. Bibcode:1984PASP...96..441G. doi:10.1086/131362 .
^ ^6.0 ^6.1 Alekseev, I. Yu. Three-Component Model of Spottedness in the Classical RS CVn System UX Ari. Astrophysics. September 2014, 57 (3): 344–351. Bibcode:2014Ap.....57..344A. S2CID 119963417. doi:10.1007/s10511-014-9339-4.
^ Karataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution. Monthly Notices of the Royal Astronomical Society. 2004, 349 (3): 1069–1092. Bibcode:2004MNRAS.349.1069K. S2CID 15290475. arXiv:astro-ph/0404219 . doi:10.1111/j.1365-2966.2004.07588.x.
^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. May 2012, 38 (5): 331–346. Bibcode:2012AstL...38..331A. ISSN 1063-7737. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015. eISSN 1562-6873.
^ ^9.0 ^9.1 Hummel, C. A.; et al. Orbital Elements and Stellar Parameters of the Active Binary UX Arietis. The Astrophysical Journal. August 2017, 844 (2): 12. Bibcode:2017ApJ...844..115H. S2CID 43383613. doi:10.3847/1538-4357/aa7b87. hdl:10871/32318 . 115.
^ Peterson, W. M.; Mutel, R. L.; Lestrade, J. -F.; Güdel, M.; Goss, W. M. Radio Astrometry of the Triple Systems Algol and UX Arietis. The Astrophysical Journal. 2011, 737 (2): 104. Bibcode:2011ApJ...737..104P. S2CID 119229905. arXiv:1104.5005 . doi:10.1088/0004-637X/737/2/104.
^ Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.
^ Tokovinin, Andrei. The Updated Multiple Star Catalog. The Astrophysical Journal Supplement Series. 2018-03-01, 235 (1): 6. Bibcode:2018ApJS..235....6T. ISSN 0067-0049. S2CID 119047709. arXiv:1712.04750 . doi:10.3847/1538-4365/aaa1a5.

進階讀物

Brinkman, Albert. High-Resolution Spectrum of UX Ari. Chandra Proposal ID #02200030. 2000: 434. Bibcode:2000cxo..prop..434B.
Drake, Stephen. Acis/hetg Spectroscopy of the Active Binaries Algol & UX Ari. Chandra Proposal ID #01200248. 1999: 20. Bibcode:1999cxo..prop...20D.
V. Aarum Ulvås & G. W. Henry. BV photometry of UX Ari in the period 1987-2002. Astronomy and Astrophysics. 2003.

外部連結

[Ulvås-1] Ulvås, V. Aarum; Henry, G. W. BV photometry of UX Ari in the period 1987–2002. Astronomy & Astrophysics. May 2003, 402 (3): 1033–1041. Bibcode:2003A&A...402.1033A. doi:10.1051/0004-6361:20030304 .

[dr3-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[IVSI-3] 3.0 ^3.1 UX Ari. The International Variable Star Index. AAVSO. [28 October 2021]. （原始内容存档于2021-10-29）.

[aar17_3_251-4] 4.0 ^4.1 Strassmeier, Klaus G. Starspots. The Astronomy and Astrophysics Review. September 2009, 17 (3): 251–308. Bibcode:2009A&ARv..17..251S. doi:10.1007/s00159-009-0020-6 .

[pasp96_441-5] 5.0 ^5.1 Guetter, H. H.; Hewitt, A. V. Photoelectric UBV photometry for 317 PZT and VZT stars. Publications of the Astronomical Society of the Pacific. June 1984, 96: 441–443. Bibcode:1984PASP...96..441G. doi:10.1086/131362 .

[ap57_3_344-6] 6.0 ^6.1 Alekseev, I. Yu. Three-Component Model of Spottedness in the Classical RS CVn System UX Ari. Astrophysics. September 2014, 57 (3): 344–351. Bibcode:2014Ap.....57..344A. S2CID 119963417. doi:10.1007/s10511-014-9339-4.

[mnras349_1_1069-7] Karataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution. Monthly Notices of the Royal Astronomical Society. 2004, 349 (3): 1069–1092. Bibcode:2004MNRAS.349.1069K. S2CID 15290475. arXiv:astro-ph/0404219 . doi:10.1111/j.1365-2966.2004.07588.x.

[xhip-8] Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. May 2012, 38 (5): 331–346. Bibcode:2012AstL...38..331A. ISSN 1063-7737. S2CID 119257644. arXiv:1108.4971 . doi:10.1134/S1063773712050015. eISSN 1562-6873.

[Hummel2017-9] 9.0 ^9.1 Hummel, C. A.; et al. Orbital Elements and Stellar Parameters of the Active Binary UX Arietis. The Astrophysical Journal. August 2017, 844 (2): 12. Bibcode:2017ApJ...844..115H. S2CID 43383613. doi:10.3847/1538-4357/aa7b87. hdl:10871/32318 . 115.

[peterson2011-10] Peterson, W. M.; Mutel, R. L.; Lestrade, J. -F.; Güdel, M.; Goss, W. M. Radio Astrometry of the Triple Systems Algol and UX Arietis. The Astrophysical Journal. 2011, 737 (2): 104. Bibcode:2011ApJ...737..104P. S2CID 119229905. arXiv:1104.5005 . doi:10.1088/0004-637X/737/2/104.

[dr3c-11] Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration= (帮助) Gaia DR3 record for this source at VizieR.

[msc-12] Tokovinin, Andrei. The Updated Multiple Star Catalog. The Astrophysical Journal Supplement Series. 2018-03-01, 235 (1): 6. Bibcode:2018ApJS..235....6T. ISSN 0067-0049. S2CID 119047709. arXiv:1712.04750 . doi:10.3847/1538-4365/aaa1a5.

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