Long-Term Changes in the Periods of SX Phe

Details Long-Term Changes in the Periods of SX Phe Long-Term Changes in the Periods of SX Phe

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasa...24...41l&link_type=abstract

Publications of the Astronomical Society of Australia, Volume 24, Issue 1, pp. 41-45.

Astronomy and Astrophysics

Astronomy

1

Stars: Oscillations, Stars: Population Ii, Stars: Variables: Delta Scuti, Stars: Individual: Sx Phe

Scientific paper

We have used times of maximum light for SX Phe, obtained by ourselves and other workers over 55 years to study the behaviour of the fundamental and first overtone radial pulsation modes of the star. We find (1/P0)dP0/dt to be (+2.53 +/- 0.05) × 10-8 yr-1 and (1/P1)dP1/dt to be (-1.60 +/- 0.03) × 10-7 yr-1, which differ significantly from the value +1.9 × 10-9 yr-1 expected if the changes are due to standard evolution of the star. The residuals in O-C from a quadratic fit cannot be explained by a light-time effect in a binary. There is some evidence that the amplitudes of the two modes change slowly with time.

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