A survey for rapid variability among early main-sequence A stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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A Stars, Main Sequence Stars, Variable Stars, Astronomical Observatories, Astronomical Photometry, Hertzsprung-Russell Diagram, Sky Surveys (Astronomy), Stellar Mass Ejection, Stellar Spectra

Scientific paper

A survey of nonpeculiar early (A0-A5) main-sequence A stars for rapid, low-amplitude variability is presented. The survey is also an independent test of the main-sequence mass-loss theory proposed by Willson et al. (1986). All observations were gathered with the University of Wisconsin Two-Star Photometer. Several period-searching methods are used to analyze time series of differential-photometric data. This instrument coupled with a computerized high-speed data collection system was used with small telescopes at Pine Bluff Observatory and Table Mountain Observatory. Several period-search methods are used to analyze time series of differential-photometric data. This instrument and data-reduction technique allow millimagnitude light variations to be detected. The survey also discovered several low-amplitude Delta Sct stars, all of which are in or blueward of the recognized instability strip.

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