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SDSS J1240+6710

SDSS J1240+6710,全称SDSS J124043.01+671034.68,昵称Dox,是一颗大气层几乎全由组成的白矮星。该颗白矮星由开普勒·德·苏沙·奥利韦拉英语Kepler de Souza Oliveira、德特列夫·凯斯特(Detlev Koester)与古斯塔沃·奥里基(Gustavo Ourique)发现[1][2][3]

概要

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SDSS J1240+6710的大气层成分除了氧之外,还侦测到镁、(低于4%),但未侦测到。对此异常组成的其中一个可能的解释是它的质量可能接近了白矮星将会塌缩成为中子星的质量上限,即钱德拉塞卡极限[4]。但是SDSS J1240+6710的质量只有太阳的0.56倍,远低于白矮星可发生将碳融合成氧、氖和镁的预期质量[5]

SDSS J1240+6710最初是在史隆数位巡天的Data Release 12释出资料中的新白矮星星表中被收录[6][7]。巴西南大河联邦大学英语Federal University of Rio Grande do Sul的物理系大学生古斯塔沃·奥里基(Gustavo Ourique)在开普勒·德·苏沙·奥利韦拉的指导下确认它拥有特殊光谱。德特列夫·凯斯特(Detlev Koester)博士则对该天体进行光谱建模以确认其组成、表面温度和质量等特征。

参考资料

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  1. ^ Kepler, S. O.; Koester, D.; Ourique, G. A white dwarf with an oxygen atmosphere. Science. 31 March 2016, 352 (6281): 67–69. PMID 27034367. doi:10.1126/science.aad6705. 
  2. ^ Herkewitz, William. Newly Discovered Star Has an Almost Pure Oxygen Atmosphere. Popular Mechanics. 31 March 2016 [2017-09-06]. (原始内容存档于2019-04-28). 
  3. ^ Gänsicke, Boris. An odd one out. Science. 1 April 2016 [2017-09-06]. (原始内容存档于2018-06-04). 
  4. ^ Hummel, Philipp. Weißer Zwerg im Sauerstoff. 30 March 2016 [1 April 2016]. (原始内容存档于2017-05-01) (德语). 
  5. ^ Witte dwergster vertoont een ongewone zuurstofatmosfeer. 31 March 2016 [1 April 2016]. (原始内容存档于2016-04-02) (荷兰语). 
  6. ^ Kepler, S. O.; Pelisoli, I.; Koester, D.; Ourique, G.; Romero, A. D.; Reindl, N.; Kleinman, S. J.; Eisenstein, D. J.; Valois, A. D. M.; Amaral, L. A. New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12. Monthly Notices of the Royal Astronomical Society. 30 November 2015, 455 (4): 3413–3423 [1 April 2016]. doi:10.1093/mnras/stv2526. (原始内容存档于2016-03-16). 
  7. ^ Grush, Loren. Astronomers spot a never-before-seen type of white dwarf star. The Verge. 31 March 2016 [1 April 2016]. (原始内容存档于2016-10-27). 
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SDSS J1240+6710
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