HR 2724 - A new bright variable in the Delta Scuti instability strip

Details HR 2724 - A new bright variable in the Delta Scuti instability strip HR 2724 - A new bright variable in the Delta Scuti instability strip

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114..131b&link_type=abstract

Astronomy and Astrophysics, vol. 114, no. 1, Oct. 1982, p. 131-134.

Astronomy and Astrophysics

Astrophysics

6

Stellar Oscillations, Variable Stars, Astronomical Photometry, Light Curve, Radial Velocity, Ubv Spectra

Scientific paper

HR 2724 is found to be a new Delta Scuti star of low amplitude by uvby photometry, with periods of 0.222 and 0.148 days and a possible third period of 0.191 days. Several possible mode identifications are discussed in light of derived period ratios. Pulsation constants of 0.034 and 0.026 for the second and third periods are in agreement with theories of radial stellar pulsation, and suggest that the third period constant corresponds to the fundamental, and the second period constant to the first harmonic mode. It is shown by four spectrograms that radial velocity is only slightly variable, while chemical composition is normal. On the basis of spectral type and mean photometric data, HR 2724 is seen as close to the high temperature and high luminosity boundary of the Delta Scuti instability strip.

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