Fig. 4
Colour−magnitude diagram of the sample of observed stars. Observational edges for the MS δ Scuti instability region (solid lines) are from Rodríguez & Breger (2001) and those for the γ Dor region (dashed lines) are from Handler & Shobbrook (2002). Red solid asterisks: PMS δ Scuti-type stars (PDS 004, HD 35187, V1409 Ori, HD 36112, and HD 261387); black solid circles: constant stars; green open circle: V350 Ori (δ Scuti-type Am star); blue open square: HD 174571 (probable β Cephei-type pulsator); red open asterisk: VV Ser (δ Scuti-type star, see text for explanation); orange open triangles: subluminous stars (HD 290500 and PX Vul); and magenta cross: HD 36910 (Am star). Upper right: error bars.
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