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We report 15 new times of maximum light for the ?? Scuti star IP Virgirnis (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 -7.4 ?? 10-9 days day-1. Evidence is also presented that IP Vir is a double-mode variable with a period ratio of ??1[??0 = 0.774. This period ratio predicts a [Fe/H] value of -0.3. From photometric (uvby??) observations, we find a foreground reddening of E(b - 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, ???Teff??? = 7400 K, and a mean surface gravity, ???log g??? = 3.89. All of these physical parameters support Landolt's initial conclusion that IP Vir is an ordinary ?? Sct star.
Additional Publication Details
Photometric studies of ?? Scuti stars. I. IP Virginis
Publications of the Astronomical Society of the Pacific