Are there any true δ set Ap stars?
Searches over the last 30 years for δ Set variability in Ap stars have yielded about 20 candidates. The validity of such detections, as well as the δ Set classification of these stars, has been a subject of much controversy. An interpretation of the accumulated data, including photelectric photometry undertaken by the author of a number of candidates, is given. One problem involves the precision of the spectroscopic classification. Other difficulties include noisy data, the lack of viable confirmations, and instrumental problems. While all candidates have not been examined thoroughly yet, there remain very few possible Ap stars that might show consistent δ Set variability.
KeywordsNone None Crimean Astrophysical Observatory Tidal Interaction Spectral Classification Instability Strip
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