The IACOB project XIII. Helium enrichment in O-type stars as a tracer of past binary interaction

被引：0
|
作者：
Martinez-Sebastian, C. [1 ,2 ]
Simon-Diaz, S. [1 ,2 ]
Jin, H. [3 ]
Keszthelyi, Z. [4 ]
Holgado, G. [1 ,2 ]
Langer, N. [3 ,5 ]
Puls, J. [6 ]
机构：
[1] Inst Astrofis Canarias, C-Via Lactea S-N, E-38205 San Cristobal la Laguna, Tenerife, Spain
[2] Univ La Laguna, Dept Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain
[3] Argelander Inst Astron, Hugel 71, DE-53121 Bonn, Germany
[4] Natl Astron Observ Japan, Ctr Computat Astrophys, Div Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[5] Max Planck Inst Radioastron, Hugel 69, DE-53121 Bonn, Germany
[6] Ludwig Maximilians Univ Munchen, Univ Sternwarte, Scheinerstr 1, D-81679 Munich, Germany
来源：
ASTRONOMY & ASTROPHYSICS | 2025年 / 693卷
关键词：
stars: abundances; stars: atmospheres; binaries: general; stars: evolution; stars: massive; VLT-FLAMES SURVEY; NITROGEN LINE SPECTROSCOPY; ATMOSPHERIC NLTE-MODELS; FOSSIL MAGNETIC-FIELDS; MASSIVE CLOSE BINARIES; X-RAY BINARIES; SURFACE ABUNDANCES; EVOLUTIONARY MODELS; STELLAR EVOLUTION; BLUE STARS;
D O I：
10.1051/0004-6361/202452622
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
There is increasing evidence that single-star evolutionary models are unable to reproduce all of the observational properties of massive stars. Binary interaction has emerged as a key factor in the evolution of a significant fraction of massive stars. In this study, we investigate the helium (YHe) and nitrogen (& varepsilon;N) surface abundances in a comprehensive sample of 180 Galactic O-type stars with projected rotational velocities of <= 150 km s(-1). We found a subsample (similar to 20% of the total, and similar to 80% of the stars with Y-He >= 0.12) with a Y-He and & varepsilon;(N) combined pattern that is unexplainable by single-star evolution. We argue that the stars with anomalous surface abundance patterns are binary interaction products.
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页数：10
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