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arXiv 1003.0997astro-ph.HEastro-ph.SR
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一个特殊双星系统中的超大质量快速自旋白矮星

An ultra-massive fast-spinning white dwarf in a peculiar binary system

S. Mereghetti, A. Tiengo, P. Esposito, N. La Palombara, G. L. Israel, L. Stella

摘要:

白矮星的质量通常在一个很窄的范围内,中心质量约为0.6太阳质量(Msun)。只有少数超大质量的白矮星(M>1.2 Msun)是已知的。双星系统中的那些特别令人感兴趣,因为少量的吸积质量可以将它们驱动到阿布拉塞卡极限之上,超过这个极限,它们就会变得引力不稳定。利用来自XMM-牛顿卫星的数据,我们仅基于动力学测量,证明X射线衍射仪RX J 0648.0 -4418是一颗质量> 1.2 Msun的白矮星。这颗超大质量的白矮星与一颗热的亚矮星在后共包层双星系统中可以达到克拉塞卡极限,并可能爆炸为Ia型超新星,当它的富氦伴星通过洛希瓣溢出以更快的速度转移质量时。

英文摘要:

White dwarfs typically have masses in a narrow range centered at about 0.6 solar masses (Msun). Only a few ultra-massive white dwarfs (M>1.2 Msun) are known. Those in binary systems are of particular interest because a small amount of accreted mass could drive them above the Chandrasekhar limit, beyond which they become gravitationally unstable. Using data from the XMM-Newton satellite, we show that the X-ray pulsator RX J0648.0-4418 is a white dwarf with mass > 1.2 Msun, based only on dynamical measurements. This ultra-massive white dwarf in a post-common envelope binary with a hot subdwarf can reach the Chandrasekhar limit, and possibly explode as a Type Ia supernova, when its helium-rich companion will transfer mass at an increased rate through Roche lobe overflow.

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