格利泽412

Gliese 412是一個位於大熊座的雙星系統。^[16] 距離太陽16光年。這兩個組成部分都是相對暗淡的紅矮星。

Gliese 412 A/B

观测数据 曆元 J2000      分點 J2000
星座	大熊座
Gliese 412 A
赤經	11h 05m 22.3101s[1]
赤緯	+43° 31′ 51.0404″[1]
視星等 (V)	8.68[2]
Gliese 412 B
赤經	11h 05m 30.8856s[3]
赤緯	+43° 31′ 17.8843″[3]
視星等 (V)	14.45[4]
特性
光谱分类	M1.0V[2]/M6.0V[4]
U−B 色指数	+1.16/—[5]
B−V 色指数	+1.54[5]/2.08[6]
天体测定
Gliese 412 A
徑向速度 (Rv)	+64.9 ± 0.9[7] km/s
自行 (μ)	赤经：2996558957000000000♠−4410.43±0.78[8] mas/yr 赤纬：7002942930000000000♠942.93±0.70[8] mas/yr
视差 (π)	203.8876 ± 0.0332[9] mas
距离	15.997 ± 0.003 ly (4.9047 ± 0.0008 pc)
绝对星等 (MV)	10.34[10]
Gliese 412 B
自行 (μ)	赤经：2996566010900000000♠−4339.891±0.167 mas/yr 赤纬：7002960780000000000♠960.780±0.162 mas/yr
视差 (π)	203.8323 ± 0.0500[11] mas
距离	16.001 ± 0.003 ly (4.906 ± 0.001 pc)
绝对星等 (MV)	16.05[10]
詳細資料
GJ 412 A
質量	0.48[10] M☉
半徑	0.38[12] R☉
表面重力 (log g)	4.90[13]
溫度	3,687[13]/ K
金属量 [Fe/H]	-0.43[13] dex
自轉速度 (v sin i)	<3[14] km/s
年齡	3[12] Gyr
GJ 412 B
質量	0.10[10] M☉
半徑	0.13[12] R☉
溫度	2,700[6] K
自轉速度 (v sin i)	7000770000000000000♠7.7±1.7[14] km/s
其他命名
BD+44°2051、​GJ 412、​CCDM J11055+4332AB、​WDS J11055+4332AB[15][2] A: HIP 54211、​SAO 43609、​G 176-11、​LAL 21258、​LFT 757、​LHS 38、​LTT 12976、​NLTT 26245[2] B: WX UMa、​G 176-12、​LFT 758、​LHS 39、​LTT 12977、​NLTT 26247[4]
參考資料庫
SIMBAD	The system
	A
	B
Gliese 412 Gliese 412在大熊座的位置

該系統的兩個恆星組成部分的預計距離約為152天文單位，估計的軌道半長軸為190天文單位。^[17] 主星大約有太陽質量的48% ，而伴星只有10%。^[10] 主星的自轉速度小於3公里/秒；伴星的自轉速度為7.7±1.7 公里/秒。^[14] 該系統的空間速度分量為 U = 141、V = –7 和 W = 7。它們是銀河系成員。^[14]

X 射線源

伴星是一顆耀星，被稱為 WX 大熊座。它的特徵是一顆UV Ceti型變星，光度偶爾會增加。早在1939年，荷蘭天文學家阿德里安·范馬納恩就觀測到了這顆恆星的耀斑。^[18]

伴星 (WX 大熊座)已被確定為X 射線源，而主星未檢測到明顯的 X 射線發射。^[19] 視差為 204.059 ±0.169 mas, 代表距離太陽約為 16 光年。^[3]

參考資料

1. 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
2. BD+44 2051. SIMBAD. 斯特拉斯堡天文資料中心.
3. 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
4. BD+44 2051B. SIMBAD. 斯特拉斯堡天文資料中心.
5. Nicolet, B. Photoelectric photometric Catalogue of homogeneous measurements in the UBV System. Observatory. 1978. Bibcode:1978ppch.book.....N.
6. Casagrande, Luca; et al. M dwarfs: effective temperatures, radii and metallicities. Monthly Notices of the Royal Astronomical Society. September 2008, 389 (2): 585–607. Bibcode:2008MNRAS.389..585C. S2CID 14353142. arXiv:0806.2471 . doi:10.1111/j.1365-2966.2008.13573.x.
7. Evans, D. S. The Revision of the General Catalogue of Radial Velocities. Batten, Alan Henry; Heard, John Frederick (编). Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. June 20–24, 1966. Bibcode:1967IAUS...30...57E.
8. van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V . arXiv:0708.1752 . doi:10.1051/0004-6361:20078357 .Vizier catalog entry
9. Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
10. The 100 nearest star systems. Research Consortium On Nearby Stars. 2009-09-14 [2009-09-14]. （原始内容存档于2007-11-12）.
11. Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数|collaboration= (帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
12. Mann, Andrew W.; et al, How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius, The Astrophysical Journal, May 2015, 804 (1): 38, Bibcode:2015ApJ...804...64M, S2CID 19269312, arXiv:1501.01635 , doi:10.1088/0004-637X/804/1/64, 64.
13. Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants. Astronomy and Astrophysics. March 2008, 480 (1): 91–101. Bibcode:2008A&A...480...91S. S2CID 16602121. arXiv:0712.1370 . doi:10.1051/0004-6361:20078788.
14. Delfosse, Xavier; Forveille, Thierry; Perrier, Christian; Mayor, Michel. Rotation and chromospheric activity in field M dwarfs. Astronomy and Astrophysics. March 1998, 331: 581–595. Bibcode:1998A&A...331..581D.
15. ** VBS 18. SIMBAD. 斯特拉斯堡天文資料中心.
16. Gould, Andrew; Chanamé, Julio. New Hipparcos-based Parallaxes for 424 Faint Stars. The Astrophysical Journal Supplement Series. February 2004, 150 (2): 455–464. Bibcode:2004ApJS..150..455G. S2CID 8494577. arXiv:astro-ph/0309001 . doi:10.1086/381147.
17. Reid, I. Neill; Gizis, John E. Low-Mass Binaries and the Stellar Luminosity Function. Astronomical Journal. June 1997, 113: 2246–2269. Bibcode:1997AJ....113.2246R. doi:10.1086/118436.
18. Joy, Alfred H. Stellar Flares. Astronomical Society of the Pacific Leaflets. June 1967, 10 (456): 41–48. Bibcode:1967ASPL...10...41J.
19. Schmitt JHMM; Fleming TA; Giampapa MS. The X-Ray View of the Low-Mass Stars in the Solar Neighborhood. Astrophys. J. September 1995, 450 (9): 392–400. Bibcode:1995ApJ...450..392S. doi:10.1086/176149.

參見

• 鄰近恆星列表
• X射线天文学