Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-09-27
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
5 pages, 4 figures. To appear in the ASP proceedings of "The 61st Fujihara seminar: Progress in solar/stellar physics with hel
Scientific paper
In oscillating stars, mixed modes have p-mode character in the envelope and g-mode character in the core. They are observed in subgiants and red giants, in which the large density gradient outside the core effectively divides the star into two coupled cavities. This leads to the phenomenon of mode bumping, in which mode frequencies are shifted from their regular spacing as they undergo avoided crossings. This short contribution introduces a new diagram that involves extending the traditional echelle diagram by replication. This new diagram should prove a useful way of displaying mixed modes and helping to identify missing modes that may lie below the detection threshold.
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