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Long-Term Changes in the Periods of SX Phe

Published online by Cambridge University Press:  05 March 2013

H. Landes ,
K. R. Bambery ,
D. W. Coates  and
K. Thompson
H. Landes
Affiliation:
School of Physics, Building 27, Monash University, Melbourne VIC 3800, Australia
K. R. Bambery*
Affiliation:
School of Physics, Building 27, Monash University, Melbourne VIC 3800, Australia
D. W. Coates
Affiliation:
School of Physics, Building 27, Monash University, Melbourne VIC 3800, Australia
K. Thompson
Affiliation:
School of Physics, Building 27, Monash University, Melbourne VIC 3800, Australia
*
BCorresponding author. Email: [email protected]
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Abstract

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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.

Keywords

stars: oscillationsstars: Population IIstars: variables: Delta Scutistars: individual: SX Phe
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 24 , Issue 1 , 2007 , pp. 41 - 45
Copyright
Copyright © Astronomical Society of Australia 2007

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