6th Nuclear Physics in Astrophysics | |
Perturbations in the upper layers of α Centauri A | |
物理学;天文学 | |
Brito, A.^1,2 ; Lopes, I.^1,3 | |
CENTRA, Physics Department, Instituto Superior Técnico, Portugal^1 | |
Departement of Mathematics, Instituto Superior de Gestão, Portugal^2 | |
Department of Physics, University of Évora, Portugal^3 | |
关键词: Asteroseismology; Diagnostic tools; External layers; Internal structure; Rapid variation; Seismic parameters; Stellar interior; Strong scatterings; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012081/pdf DOI : 10.1088/1742-6596/665/1/012081 |
|
学科分类:天文学(综合) | |
来源: IOP | |
【 摘 要 】
The emerging field of asteroseismology allows the direct study of stellar interiors with an incredibly high precision. We used a seismic parameter based on the phase shift as a diagnostic tool to infer the presence of a new layer of rapid variation in the external layers of the primary component of the stellar system Alpha Centauri AB. This layer is, apparently, a thin region where the acoustic modes suffer a strong scattering. Our tests indicate that this layer should be located at an acoustical depth of approximately 1400 s (0.939 R), which corresponds to a depth of 6% below the surface of the star. This is somehow unexpected since the internal structure of this sun-like star is predicted to be similar to the Sun.
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
Perturbations in the upper layers of α Centauri A | 765KB | download |