Amplitude variations of the Delta Scuti variable HR 2724

Details Amplitude variations of the Delta Scuti variable HR 2724 Amplitude variations of the Delta Scuti variable HR 2724

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..160b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 1, March 1991, p. 160-164.

Astronomy and Astrophysics

Astrophysics

18

Astronomical Photometry, Scutum Constellation, Stellar Luminosity, Stellar Oscillations, Variable Stars, Astronomical Observatories, Republic Of South Africa, Ubv Spectra

Scientific paper

Multisite photometric measurements of the Delta Scuti variable HR 2724 during 19 nights at SAAO and 6 nights at ESO in January 1990 show that since 1981 the amplitude of variability has decreased by a factor of three. Only the frequency of 5.80 cycles/d is common in both 1981 and 1990. The frequency of 4.0 cycles/d is dominant in the new data from both observatories. A comparison of the behavior of HR 2724 with that of other luminous nonradially pulsating delta Scuti stars is consistent with the hypothesis that a number of p modes are excited with slowly variable amplitudes. With limited amounts of data this may lead to the impression of frequency changes.

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