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arXiv 2408.01033astro-ph.SRastro-ph.IM
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计算双星中多普勒聚束因子的直接方法

Direct Method to Compute Doppler Beaming Factors in Binary Stars

Chuanjie Zheng, Yang Huang, Jifeng Liu, Youjun Lu, Henggeng Han, Yuan Tan, Timothy C. Beers

AI总结:

本文提出直接计算多普勒聚束因子的新方法,简化了蓝波段和冷恒星的计算,并公开了覆盖各类恒星的Python代码和聚束因子表。

摘要:

由恒星反射运动引起的多普勒聚束效应会引入流量调制,并为大量密近双星系统——尤其是那些包含致密天体的系统——提供一种通过测光确定质量函数的高效方法。为了将观测到的聚束流量变化转换为视向速度曲线,精确确定聚束因子至关重要。此前,该因子是在假设恒星光谱具有幂律轮廓的前提下作为常数计算的。在本研究中,我们提出了一种直接计算该因子的新方法。我们的新方法不仅简化了计算,尤其是对于蓝波段和冷恒星而言,还使我们能够评估聚束流量与视向速度之间的关系能否被准确描述为线性关系。我们开发了一个Python代码,并计算了一份适用于常用滤光片系统的综合聚束因子表,覆盖主序星、亚巨星和巨星,以及热亚矮星和白矮星。代码和表格均已存档并公开提供于 http://doi.org/10.5281/zenodo.13049419。

英文摘要:

The Doppler beaming effect, induced by the reflex motion of stars, introduces flux modulations and serves as an efficient method to photometrically determine mass functions for a large number of close binary systems, particularly those involving compact objects. In order to convert observed beaming-flux variations into a radial-velocity curve, precise determination of the beaming factor is essential. Previously, this factor was calculated as a constant, assuming a power-law profile for stellar spectra. In this study, we present a novel approach to directly compute this factor. Our new method not only simplifies the computation, especially for blue bands and cool stars, but also enables us to evaluate whether the relationship between beaming flux and radial velocity can be accurately described as linear. We develop a python code and compute a comprehensive beaming-factor table for commonly used filter systems covering main-sequence, subgiant, and giant stars, as well as hot subdwarf and white dwarf stars. Both the code and our table are archived and publicly available at http://doi.org/10.5281/zenodo.13049419.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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