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arXiv 0904.0282astro-ph.SR
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超新星1993J的双星前身

Modelling the binary progenitor of supernova 1993J

Richard J. Stancliffe, John J. Eldridge

摘要:

我们已经开发了一个详细的恒星演化代码能够以下的同时演化的两颗恒星在一个二元系统,连同他们的轨道特性。为了证明代码的能力,我们调查了IIb型超新星1993J的潜在祖先,这被认为是一个相互作用的二元系统之前,其主要爆炸。我们使用我们的详细的二进制恒星演化代码来模拟这个系统,以确定可能的范围内的主要和次要的质量,可以产生观察到的特性,这个系统,特别是参考二次。利用两颗恒星的光度和温度(由Maund等人2004年确定)和爆炸时原爆氢包层的剩余质量,我们发现,如果质量转移是100%有效的,那么观测可以由一个由15个太阳质量的主星和14个太阳质量的副星组成的系统在一个初始周期为2100年的轨道上重现天质量转移效率为50%,需要一个更大的系统,包括一个17太阳质量的初级和一个16太阳质量的次级,初始轨道为2360天。我们还调查了一些不确定性的演变,包括潮汐相互作用,对流过冲和温盐混合的影响。

英文摘要:

We have developed a detailed stellar evolution code capable of following the simultaneous evolution of both stars in a binary system, together with their orbital properties. To demonstrate the capabilities of the code we investigate potential progenitors for the Type IIb supernova 1993J, which is believed to have been an interacting binary system prior to its primary exploding. We use our detailed binary stellar evolution code to model this system to determine the possible range of primary and secondary masses that could have produced the observed characteristics of this system, with particular reference to the secondary. Using the luminosities and temperatures for both stars (as determined by Maund et al. 2004) and the remaining mass of the hydrogen envelope of the primary at the time of explosion, we find that if mass transfer is 100 per cent efficient the observations can be reproduced by a system consisting of a 15 solar mass primary and a 14 solar mass secondary in an orbit with an initial period of 2100 days. With a mass transfer efficiency of 50 per cent, a more massive system consisting of a 17 solar mass primary and a 16 solar mass secondary in an initial orbit of 2360 days is needed. We also investigate some of the uncertainties in the evolution, including the effects of tidal interaction, convective overshooting and thermohaline mixing.

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