Whole Earth Telescope Observations of the Pulsating Subdwarf B Star PG 0014+067

PG 0014+067 is one of the most promising pulsating subdwarf B stars forseismic analysis, as it has a rich pulsation spectrum. The richness of itspulsations, however, poses a fundamental challenge to understanding thepulsations of these stars, as the mode density is too complex to be explainedonly with radial and nonradial low degree (l < 3) p-modes without rotationalsplittings. One proposed solution, for the case of PG 0014+067 in particular,assigns some modes with high degree (l=3). On the other hand, theoreticalmodels of sdB stars suggest that they may retain rapidly rotating cores, and sothe high mode density may result from the presence of a few rotationally-splittriplet (l=1), quintuplet (l=2) modes, along with radial (l=0) p-modes. Toexamine alternative theoretical models for these stars, we need betterfrequency resolution and denser longitude coverage. Therefore, we observed thisstar with the Whole Earth Telescope for two weeks in October 2004. In thispaper we report the results of Whole Earth Telescope observations of thepulsating subdwarf B star PG 0014+067. We find that the frequencies seen in PG0014+067 do not appear to fit any theoretical model currently available;however, we find a simple empirical relation that is able to match all of thewell-determined frequencies in this star.Comment: 19 pages, preprint of paper accepted for publication in The Astrophysical Journa