期刊
ASTROPHYSICAL JOURNAL
卷 794, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/794/2/114
关键词
stars: interiors; stars: low-mass; stars: oscillations
资金
- NSF [AST-1105930]
- NASA [NNX13AE70G]
- NIUS program of HBCSE (TIFR)
- NASA [NNX13AE70G, 475132] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1105930] Funding Source: National Science Foundation
There are regions in stars, such as ionization zones and the interface between radiative and convective regions, that cause a localized sharp variation in the sound speed. These are known as acoustic glitches. Acoustic glitches leave their signatures on the oscillation frequencies of stars, and hence these signatures can be used as diagnostics of these regions. In particular, the signatures of these glitches can be used as diagnostics for the position of the second helium ionization zone and that of the base of the envelope convection zone. With the help of stellar models, we study the properties of these acoustic glitches in main-sequence stars. We find that the acoustic glitch due to the helium ionization zone does not correspond to the dip in the adiabatic index Gamma(1) caused by the ionization of He II, but to the peak in Gamma(1) between the He I and He II ionization zones. We find that it is easiest to study the acoustic glitch that is due to the helium ionization zone in stars with masses in the range 0.9-1.2 M-circle dot.
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