獅子座R

獅子座R
獅子座R的位置（紅圈）。
觀測資料
曆元 J2000.0
星座 獅子座
星官
赤經 09h 47m 33.4904s
赤緯 +11° 25′ 43.646″
視星等（V） 4.4 - 11.3[1]
特性
光谱分类M8IIIe[2]
视星等 (J)-0.7[3]
B−V 色指数1.26
变星类型米拉型
天体测定
距离267-370 ly
(82[2]-113.5[4] pc)
詳細資料
質量0.7[4] M☉
半徑299[2], 320-350[5] R☉
亮度5,617[2]-8,090[5] L☉
溫度2,890[2], 2,930-3,080[5] K
其他命名
R Leo、HIP 48036、HD 84748、HR 3882、BD+12° 2096、SAO 98769
參考資料庫
SIMBAD资料

獅子座R是位於獅子座的一顆米拉型變星的紅巨星，與地球距離大約300光年。

獅子座R的變光週期為312天，視星等最亮時為肉眼可見的4.31等，最暗時為11.65等，必須借助於口徑7公分以上的望遠鏡才能見到。估計它的表面有效溫度為2,890K，半徑跨度為299太陽半徑（208,000,000公里; 1.39天文單位）[2]，大致到達火星的軌道區。

可能的行星

藝術家渲染的獅子座R蒸發它的假設行星。

在2009年，威塞邁爾（Wiesemeyer）等人[4]建議觀測到的獅子座R光度准週期性的波動可能是因為存在著一顆被蒸發的次恆星天體，可能是顆太陽系外行星。他們推算出這個疑似天體的質量是木星的兩倍，軌道週期為5.2年，軌道半徑可能是2.7天文單位。

如果得到證實，這樣的天體可能是一顆蒸發中的行星，會拖著彗尾般地長長軌跡，並暗示會有強烈的SiO邁射輻射出來。

獅子座R的行星系
成員
(依恆星距離) 		质量 半長軸
(AU) 		轨道周期
(天) 		離心率 傾角 半径
b (未确认) ≥2 MJ ≥2.7 1898 0

參考資料

  1. ^ GCVS Query=R Leo. General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. [2012-08-22]. （原始内容存档于2018-08-23）. 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 De Beck, E.; Decin, L.; De Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: Derivation of mass-loss rate formulae. Astronomy and Astrophysics. 2010, 523: A18. Bibcode:2010A&A...523A..18D. arXiv:1008.1083 可免费查阅. doi:10.1051/0004-6361/200913771. 
  3. ^ V* R Leo. SIMBAD. 斯特拉斯堡天文資料中心. [2012-08-21]. 
  4. ^ 4.0 4.1 4.2 Wiesemeyer; et al. Precessing planetary magnetospheres in SiO stars?. First detection of quasi-periodic polarization fluctuations in R Leonis and V Camelopardalis. Astronomy and Astrophysics. 2009, 498 (3): 801–810. Bibcode:2009A&A...498..801W. arXiv:0809.0359 可免费查阅. doi:10.1051/0004-6361/200811242. 
  5. ^ 5.0 5.1 5.2 Fedele; et al. The K -Band Intensity Profile of R Leonis Probed by VLTI/VINCI. Astronomy and Astrophysics. 2005, 431 (3): 1019–1026. Bibcode:2005A&A...431.1019F. arXiv:astro-ph/0411133 可免费查阅. doi:10.1051/0004-6361:20042013. 

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