低金属丰度下高质量密近双星的高比例
太阳与恒星天体物理
2025-09-17 v1 星系天体物理
摘要
在高金属丰度下，大多数大质量恒星至少拥有一个近距恒星伴星。此类双星的演化受强相互作用过程支配，严重影响其终结生命的超新星及致密残余物的性质。对于高红移星系的低金属丰度环境，在导致双星相互作用的分离范围内，对大质量恒星多重性性质的约束极度缺失。在此我们表明，即使低金属丰度下，大质量恒星存在于密近双星中也是普遍现象。利用甚大望远镜，我们对小麦哲伦云中具有代表性的139颗大质量O型星样本进行了多历元视向速度测量，该星系的金属含量约为太阳值的五分之一。我们发现其中45%显示出视向速度变化，表明它们是密近双星系统的成员，且轨道周期主要短于一年。对观测偏差的修正表明，我们样本中至少70[+11:-6]%的O型星处于密近双星中，且所有O型星中至少68[+7:-8]%在其一生中与伴星发生相互作用。我们未发现支持多重性性质随金属丰度存在统计学显著趋势的证据。我们的结果表明，多重性和双星相互作用主导了大质量恒星的演化，并决定了其宇宙反馈及爆炸命运。
引用
@article{arxiv.2509.12488,
title = {A high fraction of close massive binary stars at low metallicity},
author = {H. Sana and T. Shenar and J. Bodensteiner and N. Britavskiy and N. Langer and D. J. Lennon and L. Mahy and I. Mandel and S. E. de Mink and L. R. Patrick and J. I. Villasenor and M. Dirickx and M. Abdul-Masih and L. A. Almeida and F. Backs and S. R. Berlanas and M. Bernini-Peron and D. M. Bowman and V. A. Bronner and P. A. Crowther and K. Deshmukh and C. J. Evans and M. Fabry and M. Gieles and A. Gilkis and G. Gonzalez-Tora and G. Grafener and Y. Gotberg and C. Hawcroft and V. Henault-Brunet and A. Herrero and G. Holgado and R. G. Izzard and A. de Koter and S. Janssens and C. Johnston and J. Josiek and S. Justham and V. M. Kalari and J. Klencki and J. Kubat and B. Kubatova and R. R. Lefever and J. Th. van Loon and B. Ludwig and J. Mackey and J. Maiz Apellaniz and G. Maravelias and P. Marchant and T. Mazeh and A. Menon and M. Moe and F. Najarro and L. M. Oskinova and R. Ovadia and D. Pauli and M. Pawlak and V. Ramachandran and M. Renzo and D. F. Rocha and A. A. C. Sander and F. R. N. Schneider and A. Schootemeijer and E. C. Schosser and C. Schurmann and K. Sen and S. Shahaf and S. Simon-Diaz and L. A. C. van Son and M. Stoop and S. Toonen and F. Tramper and R. Valli and A. Vigna-Gomez and J. S. Vink and C. Wang and R. Willcox},
journal= {arXiv preprint arXiv:2509.12488},
year = {2025}
}
备注
32 pages, 12 figures