維基百科

小犬座YZ

小犬座YZ 是位於小犬座中的一顆紅色恆星。視星等為11.15[2]，肉眼無法看到它。目前，這顆恆星正以+26.5公里/秒的日心徑向速度向更遠的地方移動。[4]大約162,000年前，當它以10.2光年的距離通過近日點時，它最接近地球。[12]小犬座YZ是繪架座β移動星群的潛在成員。[13]

YZ Canis Minoris

小犬座YZ的光變曲線，主圖顯示了周期性的亮度變化和幾個耀斑。插圖顯示了具有擴展時間尺度的最強耀斑。
觀測資料
曆元 J2000
星座 小犬座
星官
赤經 07h 44m 40.17230s[1]
赤緯 +03° 33′ 08.8752″[1]
視星等（V） 11.15[2]
特性
光譜分類M5 V[3]
B−V 色指數1.61[2]
天體測定
徑向速度 (Rv)+26.53±0.30[4] km/s
自行 (μ) 赤經：−347.782[1] mas/yr
赤緯：−445.702[1] mas/yr
視差 (π)166.9769 ± 0.0343[1] mas
距離19.533 ± 0.004 ly
(5.989 ± 0.001 pc)
絕對星等 (MV)12.32[5]
詳細資料
質量0.308[6] M☉
半徑0.324[6] R☉
表面重力 (log g)5.0[7]
亮度0.012[1] L☉
溫度3,125±61[8] K
金屬量 [Fe/H]−0.26±0.08[8] dex
自轉2.8[6] days
自轉速度 (v sin i)4.0[9] km/s
年齡49[10] Myr
其他命名
YZ CMI、​BD+35°2496、​GJ 285、​HIP 37766、​SAO 63793、​G 50-4、​G 112-46、​LFT 547、​LHS 1943、​LSPM J0744+0333、​LTT 12064、​NLTT 18373、​PLX 1827、​PM 07421+0341、​Ross 882、​TYC 183-2190-1、​GSC 00183-02190、​IRAS 07420+0340、​2MASS J07444018+0333089[11]
參考資料庫
SIMBAD資料
YZ Canis Minoris is located in the constellation Canis Minor
YZ Canis Minoris is located in the constellation Canis Minor
YZ
小犬座YZ在小犬座的位置

這是一顆紅矮星，恆星分類為M5V。[3] 它也是耀星，因其恆星耀斑比太陽的耀斑更強大而得名，並且大約是木星大小的三倍。[14]

參考

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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  .  已忽略未知參數|collaboration= (幫助) Gaia DR3 record for this source at VizieR.
  2. ^ 2.0 2.1 2.2 Astudillo-Defru, N.; et al. Magnetic activity in the HARPS M dwarf sample. The rotation-activity relationship for very low-mass stars through R'(HK). Astronomy & Astrophysics. April 2017, 600: 15. Bibcode:2017A&A...600A..13A. S2CID 119237202. arXiv:1610.09007  . doi:10.1051/0004-6361/201527078. A13. 
  3. ^ 3.0 3.1 West, Andrew A.; et al. An Activity-Rotation Relationship and Kinematic Analysis of Nearby Mid-to-Late-Type M Dwarfs. The Astrophysical Journal. October 2015, 812 (1): 12. Bibcode:2015ApJ...812....3W. S2CID 17434970. arXiv:1509.01590  . doi:10.1088/0004-637X/812/1/3. 3. 
  4. ^ 4.0 4.1 Nidever, David L.; et al. Radial Velocities for 889 Late-Type Stars. The Astrophysical Journal Supplement Series. August 2002, 141 (2): 503–522. Bibcode:2002ApJS..141..503N. S2CID 51814894. arXiv:astro-ph/0112477  . doi:10.1086/340570. 
  5. ^ Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971  . doi:10.1134/S1063773712050015. 
  6. ^ 6.0 6.1 6.2 Newton, Elisabeth R.; et al. The Hα Emission of Nearby M Dwarfs and its Relation to Stellar Rotation. The Astrophysical Journal. January 2017, 834 (1): 13. Bibcode:2017ApJ...834...85N. S2CID 55000202. arXiv:1611.03509  . doi:10.3847/1538-4357/834/1/85. 85. 
  7. ^ Lépine, Sébastien; et al. A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky. The Astronomical Journal. 2013, 145 (4): 102. Bibcode:2013AJ....145..102L. S2CID 117144290. arXiv:1206.5991  . doi:10.1088/0004-6256/145/4/102. 
  8. ^ 8.0 8.1 Gaidos, Eric; Mann, Andrew W. M dwarf metallicities and giant planet occurrence: ironing out uncertainties and systematics. The Astrophysical Journal. August 2014, 791 (1): 9. Bibcode:2014ApJ...791...54G. S2CID 118744016. arXiv:1406.4071  . doi:10.1088/0004-637X/791/1/54. 54. 
  9. ^ Reiners, Ansgar; et al. The CARMENES search for exoplanets around M dwarfs. High-resolution optical and near-infrared spectroscopy of 324 survey stars. Astronomy and Astrophysics. 2018, 612: A49. Bibcode:2018A&A...612A..49R. S2CID 62818673. arXiv:1711.06576  . doi:10.1051/0004-6361/201732054. 
  10. ^ Meshkat, Tiffany; et al. A Direct Imaging Survey of Spitzer-detected Debris Disks: Occurrence of Giant Planets in Dusty Systems. The Astronomical Journal. December 2017, 154 (6): 21. Bibcode:2017AJ....154..245M. S2CID 42042014. arXiv:1710.04185  . doi:10.3847/1538-3881/aa8e9a. 245. 
  11. ^ YZ CMi. SIMBAD. 斯特拉斯堡天文資料中心. 
  12. ^ Bailer-Jones, C. A. L. Close encounters of the stellar kind. Astronomy & Astrophysics. March 2015, 575: 13. Bibcode:2015A&A...575A..35B. S2CID 59039482. arXiv:1412.3648  . doi:10.1051/0004-6361/201425221. A35. 
  13. ^ Nakajima, Tadashi; Morino, Jun-Ichi. Potential Members of Stellar Kinematic Groups within 30 pc of the Sun. The Astronomical Journal. January 2012, 143 (1): 2. Bibcode:2012AJ....143....2N. doi:10.1088/0004-6256/143/1/2  . 
  14. ^ First flares on a distant star. New Scientist. February 4, 1982: 305. 
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