On the dipolar f mode of stellar oscillation

Details On the dipolar f mode of stellar oscillation On the dipolar f mode of stellar oscillation

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.326.1115c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 326, Issue 3, pp. 1115-1121.

Astronomy and Astrophysics

Astronomy

5

Stars: Oscillations

Scientific paper

The classification of adiabatic modes of non-radial stellar oscillation was established by Cowling in 1941. In addition to acoustic and gravity modes he identified an intermediate mode, which he labelled the f mode, and which in simple stellar models has no radial node. The motion of a dipolar f mode (of spherical-harmonic degree l=1) shifts the centre of mass, and must have zero frequency. On the other hand, if the perturbation to the gravitational potential is neglected (the case considered by Cowling) the f mode has a frequency intermediate between those of the gravity and acoustic modes; this is true of modes of any degree (l>=1). Here we consider the properties of the dipolar f mode, elucidating the origin of these differences through continuous transformations between the various relevant cases; in addition, we discuss the broader issues of the classification of modes of non-radial oscillation.

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