MOST observations of the Herbig Ae δ-Scuti star HD 34282

ABSTRACT MOSTobservations and model analysis of the Herbig Ae star HD 34282 (V1366 Ori)reveal δScuti pulsations. 22 frequencies are observed, 10 of which confirm those pre-viously identified by Amado et al. (2006), and 12 of which are newly discovered inthis work. We show that the weighted-average frequency in each group fits the radialp-mode frequencies of viable models. We argue that the observed pulsation spectrumextends just to the edge to the acoustic cut-off frequency and show that this also isconsistent with our best-fitting models.Key words: asteroseismology – techniques: photometric – stars: pre-main sequence– stars: individual: HD 34282 – stars: variables: δScuti. 1 HD 34282 PECULIARITIESHD 34282 (V1366 Ori, PDS 176) is a Herbig Ae (HAe) star(the cool A-range subset of the Herbig AeBe stars) thatis also a δ Scuti star. Pulsations were originally discoveredby Amado et al. (2004), with ten frequencies later identi-fied by Amado et al. (2006) using multi-site ground-basedphotometry. The observed frequencies, from 64.7 to 79.4 cy-cles/day (d