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The Microvariability and Oscillations of stars (MOST) satellite has detectedlow-amplitude light variations ($\Delta m\sim$1 mmag) in the Be star $\beta$CMi (B8Ve). The observations lasted 41 days and the variations have typicalperiods $\sim 0.3$ days. We demonstrate that the dominant frequencies areconsistent with prograde high-order g-modes of $m=-1$ excited by the Fe-bump ofopacity in an intermediate-mass ($\approx 3.5 M_\odot$) star with a nearlycritical rotation period of 0.38 days. This is the first detection of nonradialg-mode pulsations in a Be star later than B6 leading to the possibility thatpulsations are excited in all classical Be stars.Comment: 17 pages, 6 figures; Astrophysical Journal part 1 in pres

MOSTDetectsg‐Modes in the Late‐Type Be Star β Canis Minoris (B8 Ve)