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Photometric studies of ?? Scuti stars. I. IP Virginis

Publications of the Astronomical Society of the Pacific

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Abstract

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

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Photometric studies of ?? Scuti stars. I. IP Virginis
Series title:
Publications of the Astronomical Society of the Pacific
Volume
110
Issue:
746
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Publications of the Astronomical Society of the Pacific
First page:
451
Last page:
457
Number of Pages:
7