維基百科

格利澤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
觀測數據
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
光譜分類M1.0V[2]/M6.0V[4]
U−B 色指數+1.16/—[5]
B−V 色指數+1.54[5]/2.08[6]
天體測定
Gliese 412 A
徑向速度 (Rv)+64.9 ± 0.9[7] km/s
自行 (μ) 赤經：−4410.43±0.78[8] mas/yr
赤緯：942.93±0.70[8] mas/yr
視差 (π)203.8876 ± 0.0332[9] mas
距離15.997 ± 0.003 ly
(4.9047 ± 0.0008 pc)
絕對星等 (MV)10.34[10]
Gliese 412 B
自行 (μ) 赤經：−4339.891±0.167 mas/yr
赤緯：960.780±0.162 mas/yr
視差 (π)203.8323 ± 0.0500[11] mas
距離16.001 ± 0.003 ly
(4.906 ± 0.001 pc)
絕對星等 (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
金屬量 [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)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
SIMBADThe system
A
B
Gliese 412 is located in the constellation Ursa Major.
Gliese 412 is located in the constellation Ursa Major.
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. ^ 1.0 1.1 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中此天體在蓋亞望遠鏡第二批數據發布的記錄
  2. ^ 2.0 2.1 2.2 2.3 BD+44 2051. SIMBAD. 斯特拉斯堡天文資料中心. 
  3. ^ 3.0 3.1 3.2 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中此天體在蓋亞望遠鏡第二批數據發布的記錄
  4. ^ 4.0 4.1 4.2 BD+44 2051B. SIMBAD. 斯特拉斯堡天文資料中心. 
  5. ^ 5.0 5.1 Nicolet, B. Photoelectric photometric Catalogue of homogeneous measurements in the UBV System. Observatory. 1978. Bibcode:1978ppch.book.....N. 
  6. ^ 6.0 6.1 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 (編). 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. ^ 8.0 8.1 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  .  已忽略未知參數|collaboration= (幫助) (勘誤: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  10. ^ 10.0 10.1 10.2 10.3 10.4 The 100 nearest star systems. Research Consortium On Nearby Stars. 2009-09-14 [2009-09-14]. （原始內容存檔於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  .  已忽略未知參數|collaboration= (幫助) (勘誤: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  12. ^ 12.0 12.1 12.2 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. ^ 13.0 13.1 13.2 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. ^ 14.0 14.1 14.2 14.3 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

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