OBSERVATIONAL SIGNATURES OF CONVECTIVELY DRIVEN WAVES IN MASSIVE STARS

被引：74
作者：
Aerts, C. [1 ,2 ]
Rogers, T. M. [3 ,4 ]
机构：
[1] Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Leuven, Belgium
[2] Radboud Univ Nijmegen, IMAPP, Dept Astrophys, NL-6500 GL Nijmegen, Netherlands
[3] Newcastle Univ, Dept Math & Stat, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[4] Planetary Sci Inst, Tucson, AZ 85721 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 806卷 / 02期
关键词：
asteroseismology; line: profiles; stars: massive; stars: oscillations; techniques: photometric; waves; MAIN-SEQUENCE STARS; B-TYPE STARS; ANGULAR-MOMENTUM TRANSPORT; GRAVITY MODES; STOCHASTIC EXCITATION; GALACTIC O; ROTATION; OSCILLATIONS; ASTEROSEISMOLOGY; IMPACT;
D O I：
10.1088/2041-8205/806/2/L33
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We demonstrate observational evidence for the occurrence of convectively driven internal gravity waves (IGWs) in young massive O-type stars observed with high-precision CoRoT space photometry. This evidence results from a comparison between velocity spectra based on two-dimensional hydrodynamical simulations of IGWs in a differentially rotating massive star and the observed spectra. We also show that the velocity spectra caused by IGWs may lead to detectable line-profile variability and explain the occurrence of macroturbulence in the observed line profiles of OB stars. Our findings provide predictions that can readily be tested by including a sample of bright, slowly and rapidly rotating OB-type stars in the scientific program of the K2 mission accompanied by high-precision spectroscopy and their confrontation with multi-dimensional hydrodynamic simulations of IGWs for various masses and ages.
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页数：5
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