Long-Term Changes in the Periods of SX Phe

Autor:	K. Thompson, D. W. Coates, Howard Ian Landes, Keith R. Bambery
Rok vydání:	2007
Předmět:	Physics Stars Amplitude Space and Planetary Science Overtone Astronomy and Astrophysics Quasar Astrophysics Term (time)
Zdroj:	Publications of the Astronomical Society of Australia. 24:41-45
ISSN:	1448-6083 1323-3580
DOI:	10.1071/as06025
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::26b71b3dfc8488f0c2a4835e7a16263b https://doi.org/10.1071/as06025 Zobrazit plný text záznamu