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On the period variability of GP andromedae

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Abstract

The present paper deals with the pulsation period variability of the high-amplitude δ Scuti star GP Andromedae using a data set covering a time base of 26.9 years. The possibility of a periodic component (reflecting the light-time effect induced by a hypothetic binarity) in the O-C curve is inferred. The presence of this periodicity in the period variation of GP And leads to a diminution of the discrepancy between predicted and observed relative period change rates. The hypothesis of the existence of an unseen companion is discussed. The statistical analysis of the final O-C residuals distribution, indicates their normal or close to normal character.

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Authors and Affiliations

  1. Astronomical Observatory Cluj-Napoca, Astronomical Institute of the Romanian Academy, Str. Cireşilor 19, RO-3400, Cluj-Napoca, Romania

    Alexandru Pop & Dan Moldovan

  2. Faculty of Chemistry and Chemical Engineering, Babeş-Bolyai University, Str. Arany Janos 11, RO-3400, Cluj-Napoca, Romania

    Victor Liteanu

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  1. Alexandru Pop
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  2. Victor Liteanu
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  3. Dan Moldovan
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Pop, A., Liteanu, V. & Moldovan, D. On the period variability of GP andromedae. Astrophysics and Space Science 284, 1207–1222 (2003). https://doi.org/10.1023/A:1023663406679

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