Delta Scuti stars: continuosly in progress

Details Delta Scuti stars: continuosly in progress Delta Scuti stars: continuosly in progress

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994dssn....7....8r&link_type=abstract

Delta Scuti Star Newsletter, Issue 7, p. 8-11.

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Scientific paper

In the past few years much progress has been made in the study of Delta Scuti stars, specially from an observational point of view. The number of these variables is continuously increasing as a result of discoveries of new members. Furthermore, new observations of stars previously regarded as constant, in the lower part of the instability strip, have been shown to be new variables with very small amplitudes. An immense effort has also been expended to study a number of Delta Scuti stars with complex pulsation frequency spectraby means of internationally coordinated observing campaigns covering individual stars, which have given very interesting and definitive results. Global frequency spectra have been satisfactorily resolved in some stars; new frequencies have been identif1ed in others; several variables have been found to pulsate in a large number of simultaneously excited nonradial p-modes; nonradial pulsation has also been found in several of these stars where only one pulsation frequency had been previously identified. Some o Scuti variables have shown to exhibit variable amplitudes whereas others show constant both frequencies and amplitudes. New periods and period changes have also been recently determined for a number of these variables which have been compared with those expected from stellar evolutionary tracks inside the lower instability strip. Insummary,our knowledge about Delta Scuti stars is continuously increasing in almost all respects; both literature and the number of these stars are growing every day.

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