Steindl Thomas, Zwintz Konstanze, Vorobyov Eduard
Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstraße 25, A-6020, Innsbruck, Austria.
Department of Astrophysics, University of Vienna, A-1180, Vienna, Austria.
Nat Commun. 2022 Sep 19;13(1):5355. doi: 10.1038/s41467-022-32882-0.
In the earliest phases of their evolution, stars gain mass through the acquisition of matter from their birth clouds. The widely accepted classical concept of early stellar evolution neglects the details of this accretion phase and assumes the formation of stars with large initial radii that contract gravitationally. In this picture, the common idea is that once the stars begin their fusion processes, they have forgotten their past. By analysing stellar oscillations in recently born stars, we show that the accretion history leaves a potentially detectable imprint on the stars' interior structures. Currently available data from space would allow discriminating between these more realistic accretion scenarios and the classical early stellar evolution models. This opens a window to investigate the interior structures of young pulsating stars that will also be of relevance for related fields, such as stellar oscillations in general and exoplanet studies.
在恒星演化的最初阶段，恒星通过从其诞生云团中获取物质来增加质量。早期恒星演化的广泛接受的经典概念忽略了这个吸积阶段的细节，并假设形成具有大初始半径的恒星，这些恒星通过引力收缩。在这种情况下，普遍的观点是，一旦恒星开始其聚变过程，它们就忘记了自己的过去。通过分析最近诞生的恒星中的恒星振荡，我们表明吸积历史在恒星的内部结构上留下了潜在可检测的印记。目前来自太空的现有数据将有助于区分这些更现实的吸积情景和经典的早期恒星演化模型。这为研究年轻脉动恒星的内部结构打开了一扇窗口，这对于相关领域也将具有重要意义，比如一般的恒星振荡和系外行星研究。
