The delta Scuti variability of the high metallicity delta Del star, rho Pavonis

Astronomy and Astrophysics – Astronomy

Scientific paper

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A Stars, Metallic Stars, Stellar Oscillations, Stellar Spectrophotometry, Variable Stars, Light Curve, Radial Velocity, Stellar Radiation

Scientific paper

The δ Del star, ρ Pav, is announced to be a δ Scuti variable (Δy ≤ 0.03 mag). Thirty-nine hours of observations in both b and y colours are presented. It appears that ρ Pav pulsates with more than one frequency, but the present data are inadequate to derive a definitive frequency solution. A frequency analysis of both the b and y data indicates that f1 = 8.761 ± 0.014 day-1 is the frequency of highest amplitude. Simultaneous light and radial velocity observations were obtained on one night which yield (ΔR/R)/ΔMbol = 0.11, a value typical of δ Scuti stars. The δ Del spectral classification of ρ Pav and its metallicity index, δm0 = -0.092, both indicate that it is probably a metallic line star.

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