Pulsational characteristics of the Delta Scuti star HD 2724

Details Pulsational characteristics of the Delta Scuti star HD 2724 Pulsational characteristics of the Delta Scuti star HD 2724

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995dssn....9....4b&link_type=abstract

Delta Scuti Star Newsletter, Issue 9, p. 4

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Scientific paper

This star has been recently studied by Lampens (1992, A&AS 95, 471), who observed it in two, one year distant, seasons obtaining 330 photometric datapoints. On the basis of these data she has been unable to find a common frequency solution for the two seasons, confidently identifying two frequencies (7.38 and 5.73 c/d) and suggesting the presence of some others. We observed this star at ESO in a simultaneous photometric-spectroscopic campaign in September 1993. We collected 885 measurements in the Stromgren photometric system distributed in 11 almost consecutive nights (about 90 hours of observing time), and 154 high resolution spectrograms in 5 consecutive nights (34 hours of monitoring). The frequency analysis of the photometric data allowed us to detect 10 pulsation modes at 4.33, 4.79, 5.32, 5.58, 5.73, 5.86, 6.13, 6.49, 7.38 and 8.06 c/d. The y semi-amplitudes ranges from 8.7 to 2.8 mmag, and this solution gives a satisfactorily fit of the light curve. The terms at 4.33, 5.73, 6.13, 6.49, 7.38 c/d coincide with some of those suggested by Lampens.

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