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Paper: Very Short-Term Line Profile Variability in the Be Star π Aquarii
Volume: 337, The Nature and Evolution of Disks Around Hot Stars
Page: 294
Authors: Peters, G.J.; Gies, D.R.
Abstract: Short-term line profile variability observed in π Aqr during its recent non-emission phase has been analyzed using the technique of Gies & Kullavanijaya (1988). Data from three observing runs at the Kitt Peak National Observatory in 1999, 2000, and 2001 suggest that the star is pulsating in a nonradial l = −m = 5 p mode with a period of ~1.88 hr. The pulsations appear to be photospheric in origin, but significantly different than the half-day, low-order l = −m = 2 g-mode activity observed in the Be star μ Cen during this star's non-emission episode in the 1980s and 1990s.
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