本星系群共生星族及其与Ia型超新星的微弱联系
The Local Group Symbiotic Star Population and its Tenuous Link with Type Ia Supernovae
AI总结：
本文结合经验分布约束与双星演化理论，估计银河系及本星系群矮星系的共生系统数量，并发现其通过单简并通道对Ia型超新星的贡献仅约1%。
摘要：
双星是受引力束缚的恒星系统，其中每个组成部分的演化都会显著影响其伴星乃至整个系统的演化。在某些情况下，这些系统的演化会导致形成红巨星—白矮星系统，并可能表现出共生特征。本工作的主要目标是以统计方式促进对银河系及本星系群（LG）矮星系中共生系统（SySt）数量的估计。此外，我们还旨在推断SySt对Ia型超新星（SN Ia）事件的最大贡献。鉴于以往估计存在显著差异，我们提出两种不同方法来约束预期的SySt数量：一种是经验方法，另一种是理论方法。这些方法旨在为SySt数量提供稳健估计。对于银河系，我们利用已知SySt的位置和速度数据来确定其分布。基于这些性质，我们将银河系SySt数量的下限约束在800至4100之间。我们的理论方法依赖零龄主序双星的性质和已知双星演化路径，表明银河系中的SySt数量为(53±6)×10^3个。LG矮星系的统计SySt数量低1至4个数量级，这主要取决于星系的热光度，其次取决于其双星比例和金属丰度。在本工作中，来自共生前身星的SNe Ia单简并通道贡献在银河系中估计约为1%。
英文摘要：
Binary stars are gravitationally bound stellar systems where the evolution of each component can significantly influence the evolution of its companion and the system as a whole. In certain cases, the evolution of these systems can lead to the formation of a red giant-white dwarf system, which may exhibit symbiotic characteristics. The primary goal of this work is to contribute in a statistical way to the estimation of the symbiotic system (SySt) population in the Milky Way and in the dwarf galaxies of the Local Group (LG). Additionally, we aim to infer the maximum contribution of SySt to Type Ia supernova (SN Ia) events. Given the significant discrepancies in previous estimates, we propose two distinct approaches to constrain the expected SySt population: one empirical and another theoretical. These approaches are designed to provide a robust estimation of the SySt population. For the Milky Way, we utilized position and velocity data of known SySts to determine their distribution. Based on these properties, we constrained the lower limit for the Galactic SySt population in the range of 800-4,100. Our theoretical approach, which relies on the properties of zero-age main-sequence binaries and known binary evolutionary paths, suggests a SySt population of $(53\pm6)\times10^3$ SySt in the Galaxy. The statistical SySt populations for LG dwarf galaxies are one to four orders of magnitude lower, primarily dependent on the galaxies' bolometric luminosity and, to a lesser extent, their binary fraction and metallicity. In this work, the contribution of the single-degenerate channel of SNe Ia from symbiotic progenitors is estimated to be of the order of 1% for the Galaxy.
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