ORIGIN OF DUST AROUND V1309 SCO
ORIGIN OF DUST AROUND V1309 SCO
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DOI：
10.1088/0004-637x/777/1/23
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
Chunhua Zhu;G. Lü;Zhaojun Wang
中科院分区：
文献类型：
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作者：
Chunhua Zhu;G. Lü;Zhaojun Wang
星际介质中尘埃颗粒的起源仍然是一个没有答案的问题。尼科尔斯等人发现V1309 Sco周围存在大量尘埃，可能是由一对接触双星合并而成。我们调查周围的尘埃V1309斯科的起源，并建议这些尘埃颗粒产生的二进制合并喷出物。通过AGBDUST代码，我们估计产生了半径为10 - 5 cm的10 - 5.2 × 10 - 4 M的尘埃颗粒。这些尘埃颗粒主要由硅酸盐和铁颗粒组成。由于双星合并喷出物的质量很小，双星合并喷出物产生的尘埃对星际介质中总尘埃产生的贡献可以忽略不计。然而，重要的是要注意，在V1309 Sco周围发现大量尘埃为共同包层喷出物提供了尘埃形成和生长的理想环境的想法提供了直接支持。因此，我们确认普通包层喷出物可能是宇宙尘埃的重要来源。
The origin of dust grains in the interstellar medium is still an unanswered problem. Nicholls et al. found the presence of a significant amount of dust around V1309 Sco, which may originate from the merger of a contact binary. We investigate the origin of dust around V1309 Sco and suggest that these dust grains are produced in the binary-merger ejecta. By means of the AGBDUST code, we estimate that ∼5.2 × 10−4 M☉ dust grains are produced with a radii of ∼10−5 cm. These dust grains are mainly composed of silicate and iron grains. Because the mass of the binary merger ejecta is very small, the contribution of dust produced by binary merger ejecta to the overall dust production in the interstellar medium is negligible. However, it is important to note that the discovery of a significant amount of dust around V1309 Sco offers a direct support for the idea that common-envelope ejecta provides an ideal environment for dust formation and growth. Therefore, we confirm that common envelope ejecta can be important source of cosmic dust.