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

Details A survey for rapid variability among early main sequence A stars. A survey for rapid variability among early main sequence A stars.

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991srva.book.....s&link_type=abstract

A survey for rapid variability among early main sequence A stars., by Schutt, R. L.. Wis. Astrophys., No. 394,

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

This is a survey of non-peculiar early (A0 - A5) main sequence A stars for rapid (4 - 30 minutes), low-amplitude (<10 millimagnitudes) variability. The purpose of the survey is to detect variability, not to resolve all frequencies that may be involved. Survey targets are chosen based on the balance of information available at the time. Several stars are included in the survey as secondary targets, i.e., comparison stars that are also of the appropriate spectral type. These secondary targets are sometimes faint and therefore not well-studied. All observations were gathered with the University of Wisconsin Two-Star Photometer. Several period-searching methods were used to analyze time series of differential-photometric data. Noise levels in the raw data are typically several times as large as the expected signals. The survey did produce a few stars that are suspected of rapid variability and should be monitored with time. However, there is apparently no evidence for large scale rapid variability among the non-peculiar early main sequence A stars. The survey also produced several low-amplitude δ Scuti stars, all of which are in or blueward of the recognized instability strip. These stars verify predictions that δ Scuti stars exist at lower amplitudes, and may also indicate they are present at earlier spectral types.

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