SIMBAD references

We report 15 new times of maximum light for the δ Scuti star IP Virginis (formerly known as SA 106-1024). An analysis of all times of maximum light indicates that IP Vir has been decreasing in period at a constant rate of -7.4x10^–9 days.day^–1. Evidence is also presented that IP Vir is a double-mode variable with a period ratio of π₁Mπ₀=0.774. This period ratio predicts a [Fe/H] value of -0.3. From photometric (uvbyβ) observations, we find a foreground reddening of Eb-y=0.008 mag and a metallicity of [Fe/H] = +0.05. It is shown that [Fe/H] = -0.3 is most likely the correct value. Intrinsic b-y- and c₁-values, plotted in a model atmosphere grid, indicate a mean effective temperature, <T_eff≥7400 K, and a mean surface gravity, <logg≥3.89. All of these physical parameters support Landolt's initial conclusion that IP Vir is an ordinary δ Sct star.