Incidence of high-amplitude delta Scuti type variable stars

Abstract

An order-of-magnitude estimate for the incidence of high-amplitude delta Scuti-type variable stars (HADS) in the delta Scuti area of the H-R diagram is calculated. Using a model for the stellar distribution in the Milky Way, we calculate the number of stars that are expected to fall in the delta Scuti area of the H-R diagram within the magnitude range and sky coverage of the ROTSE Survey for Variables I (RSV1). The incidence of the HADS phenomenon is then obtained by comparing the number of stars calculated by the model and the actual, observed number of HADS in the RSV1. We find that ~0.3 % of the stars that lie in the delta Scuti area of the H-R diagram within the RSV1 observational limits exhibit the HADS phenomenon. This number is much lower than the incidence of the low-amplitude delta Scuti stars (LADS), ~>1/3, implying that the HADS phenomenon takes place in a very small fraction of stars and/or its duration is very short, compared to the LADS.

To appear in June 2008 issue of PASJ

References in corpus (3)

• Northern Sky Variability Survey (NSVS): Public data release
• Fourier decomposition and frequency analysis of the pulsating stars with P<1 d in the OGLE database. I. Monoperiodic Delta Scuti, RRc and RRab variables. Separation criteria and particularities
• Preparing the COROT space mission: incidence and characterisation of pulsation in the Lower Instability Strip

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