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arXiv 0710.5103astro-ph
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从低质量到高质量恒星的ISM尘埃反馈

ISM dust feedback from low to high mass stars

Falceta-Goncalves, D.

备注：
Accepted for publication by A&A
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摘要：

星际介质中的尘埃成分在过去的几十年中得到了广泛的研究。晚型星被认为是ISM尘埃的主要来源，但最近的观测表明超新星遗迹可能在ISM尘埃反馈中起作用。在这项工作中，我研究的重要性，低和高质量的恒星，以及它们的演化阶段，对ISM尘埃反馈过程。我还确定了不同的质量分布函数和恒星形成历史的变化所获得的结果。我们描述了一个半经验计算的相对重要性，每个恒星在每个演化阶段的尘埃喷射到ISM。我比较了两个恒星质量分布函数，经典的Salpeter初始质量函数和现在的质量函数所获得的结果。我使用了每个恒星质量的演化轨迹模型，以及经验的质量损失率和尘埃与气体的比率。每个恒星质量的相对贡献取决于所使用的分布。来自大质量恒星的喷出物是使用Salpeter IMF进行ISM尘埃补充的最重要对象。另一方面，对于今天的质量函数，低质量和中等质量的恒星占主导地位。晚型巨星和超巨星在我们实际的银河系中主导着ISM尘埃反馈，但这可能不是经历高恒星形成率或高红移的星系的情况。在这些情况下，SNe在粉尘反馈过程中占主导地位。

英文摘要：

The dust component of the interstellar medium (ISM) has been extensively studied in the past decades. Late-type stars have been assumed as the main source of dust to the ISM, but recent observations show that supernova remnants may play a role on the ISM dust feedback. In this work, I study the importance of low and high mass stars, as well as their evolutionary phase, on the ISM dust feedback process. I also determine the changes on the obtained results considering different mass distribution functions and star formation history. We describe a semi-empirical calculation of the relative importance of each star at each evolutionary phase in the dust ejection to the ISM. I compare the obtained results for two stellar mass distribution functions, the classic Salpeter initial mass function and the present day mass function. I used the evolutionary track models for each stellar mass, and the empirical mass-loss rates and dust-to-gas ratio. The relative contribution of each stellar mass depends on the used distribution. Ejecta from massive stars represent the most important objects for the ISM dust replenishment using the Salpeter IMF. On the other hand, for the present day mass function low and intermediate mass stars are dominant. Late-type giant and supergiant stars dominate the ISM dust feedback in our actual Galaxy, but this may not the case of galaxies experiencing high star formation rates, or at high redshifts. In those cases, SNe are dominant in the dust feedback process.

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