天兔座AK

天兔座AK是南天星座天兔座中的一顆變星。它的視星等為6.141等[3],因此,根據波特爾暗空分類法,在夜間它從鄉村天空中隱約可見。這顆恆星與廁三形成目視雙星:兩者的角距離為97",使得即使在最佳條件下也很難用肉眼將它們分開[12]。廁三和天兔座AK都是大熊座移動星群的成員,它們在太空中有着相同的自行[6]

天兔座AK(AK Leporis)

天兔座AK的可見光光變曲線,改編自Nitschelm et al(2000)[1]
觀測資料
曆元 J2000
星座 天兔座
星官
赤經 05h 44m 26.543s[2]
赤緯 −22° 25′ 18.77″[2]
視星等(V) 6.141[3]
特性
光譜分類K2V[4]
U−B 色指數+0.74[5]
B−V 色指數+0.96[5]
變星類型BY Draconis[4]
天體測定
徑向速度 (Rv)−9.57 ± 0.13[6] km/s
自行 (μ) 赤經:−304.4[7] mas/yr
赤緯:−352.2[7] mas/yr
視差 (π)112.0[8] mas
距離28 ly
(9.0[9] pc)
絕對星等 (MV)6.31[3]
詳細資料
表面重力 (log g)4.66 ± 0.01[10]
溫度4,869 ± 61[10] K
金屬量 [Fe/H]0.01 ± 0.06[10] dex
自轉速度 (v sin i)2.8 ± 1.8[6] km/s
年齡0.9[9] Gyr
其他命名
BD22 1210、GJ 216 B、HD 38392、HR 1982、LTT 2363、SAO 170757[11], γ Leporis B[1]
參考資料庫
SIMBAD資料

這是一顆天龍座BY型變星,由於恆星的活動而經歷亮度的變化。差異自轉導致變化週期取決於緯度活動的變化[4]。已經在天兔座AK檢測到X射線發射,它位於電波源或附近[8]

對這顆變星的紅外線觀測顯示,在24μm的波長處有大量過量。這可能是由於廁三靠近視線,或者可能存在紅矮星伴星或塵埃盤。但在70μm處沒有觀察到過量[9]

參考資料

  1. ^ 1.0 1.1 Nitschelm, C.; des Etangs, A. Lecavelier; Vidal-Madjar, A.; Ferlet, R.; Olsen, E. H.; Dennefeld, M. A three-year Strömgren photometric survey of suspected β Pictoris-like stars. Astronomy and Astrophysics Supplement Series. August 2000, 145: 275–281 [19 January 2022]. doi:10.1051/aas:2000243. (原始內容存檔於2022-01-19). 
  2. ^ 2.0 2.1 Roeser, S.; Bastian, U., A new star catalogue of SAO type, Astronomy and Astrophysics Supplement Series, September 1988, 74 (3): 449–451, Bibcode:1988A&AS...74..449R. 
  3. ^ 3.0 3.1 3.2 Nordström, Andersen; et al, The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs, Publications of the Astronomical Society of Australia, 2004, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013 . 
  4. ^ 4.0 4.1 4.2 Lecavelier Des Etangs, A.; et al, A photometric survey of stars with circumstellar material, Astronomy and Astrophysics, August 2005, 439 (2): 571–574, Bibcode:2005A&A...439..571L, doi:10.1051/0004-6361:20042401 . 
  5. ^ 5.0 5.1 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data (SIMBAD), 1986, Bibcode:1986EgUBV........0M. 
  6. ^ 6.0 6.1 6.2 Biazzo, K.; et al, Elemental abundances of low-mass stars in nearby young associations: AB Doradus, Carina Near and Ursa Major, Monthly Notices of the Royal Astronomical Society, December 2012, 427 (4): 2905–2916, Bibcode:2012MNRAS.427.2905B, S2CID 118617986, arXiv:1209.2591 , doi:10.1111/j.1365-2966.2012.22132.x. 
  7. ^ 7.0 7.1 Høg, E.; et al, The Tycho-2 catalogue of the 2.5 million brightest stars, Astronomy and Astrophysics, March 2000, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862. 
  8. ^ 8.0 8.1 Lazio, T. Joseph W.; et al, A Blind Search for Magnetospheric Emissions from Planetary Companions to Nearby Solar-Type Stars, The Astronomical Journal, January 2010, 139 (1): 96–101, Bibcode:2010AJ....139...96L, S2CID 118537554, arXiv:0910.3938 , doi:10.1088/0004-6256/139/1/96. 
  9. ^ 9.0 9.1 9.2 Lawler, S. M.; et al, Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars, The Astrophysical Journal, November 2009, 705 (1): 89–111, Bibcode:2009ApJ...705...89L, S2CID 1272803, arXiv:0909.0058 , doi:10.1088/0004-637X/705/1/89. 
  10. ^ 10.0 10.1 10.2 Prugniel, Ph.; et al, The atmospheric parameters and spectral interpolator for the MILES stars, Astronomy & Astrophysics, July 2011, 531: A165, Bibcode:2011A&A...531A.165P, S2CID 54940439, arXiv:1104.4952 , doi:10.1051/0004-6361/201116769. 
  11. ^ V* AK Lep. SIMBAD. 斯特拉斯堡天文資料中心. 
  12. ^ Kaler, James B., Gamma Leporis, Stars (University of Illinois), [2015-04-02], (原始內容存檔於2022-12-05).