Abstract
Oscillations in solar-like oscillators tend to follow an approximately regular pattern in which oscillation modes of a certain degree and consecutive order appear at regular intervals in frequency, i.e. the so-called large frequency separation. This is true to first order approximation for acoustic modes. However, to a second order approximation it is evident that the large frequency separation changes as a function of frequency. This frequency dependence has been seen in the Sun and in other main-sequence stars. However, from observations of giant stars, this effect seemed to be less pronounced. We investigate the difference in frequency dependence of the large frequency separation between main-sequence and giant stars using YREC evolutionary models.
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Acknowledgements
SH acknowledges financial support from the Netherlands Organization for Scientific Research. SB acknowledges NSF grant AST-1105930. YE and WJC acknowledge financial support of UK STFC.
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Hekker, S., Basu, S., Elsworth, Y., Chaplin, W.J. (2013). Frequency Dependence of Δν of Solar-Like Oscillators Investigated: Influence of HeII Ionization Zone. In: Suárez, J., Garrido, R., Balona, L., Christensen-Dalsgaard, J. (eds) Stellar Pulsations. Astrophysics and Space Science Proceedings, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29630-7_14
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DOI: https://doi.org/10.1007/978-3-642-29630-7_14
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