Frequency and amplitude variations of CD-24 7599

Details Frequency and amplitude variations of CD-24 7599 Frequency and amplitude variations of CD-24 7599

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dssn...10...21h&link_type=abstract

Delta Scuti Star Newsletter, Issue 10, p. 21

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CD-24 7599 is a multiperiodic Delta Scuti star. It was observed twice with the Whole Earth Telescope (WET, Nather et al. 1990, ApJ 361, 309) network. With these data, 13 pulsation frequencies were detected (Handler et al. 1996, MNRAS, submitted). A seismological analysis (Handler et al. 1996) showed that CD-24 7599 is an 1.85 +/- 0.05 Mo object in the first half of its main sequence evolution. However, it was also noticed that significant amplitude variations occurred within the two years between the two WET runs. Since this time scale for amplitude variations of a Delta Scuti star appeared to be very short, it was decided to monitor the star more often in order constrain this time scale. Of course, such long-term monitoring also allows to look for possible frequency variations. Here, we briefly report on the results of the first four years of this program.

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