Photometric Studies of delta Scuti Stars. I. IP Virginis

Details Photometric Studies of delta Scuti Stars. I. IP Virginis Photometric Studies of delta Scuti Stars. I. IP Virginis

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110..451j&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 746, pp. 451-457.

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5

Stars: Variables: Other, Stars: Oscillations, Stars: Atmospheres

Scientific paper

We report 15 new times of maximum light for the delta 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 pi_1/pi_0=0.774. This period ratio predicts a [Fe/H] value of -0.3. From photometric (uvbybeta) 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 c_1-values, plotted in a model atmosphere grid, indicate a mean effective temperature, =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 delta Sct star.

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