The Light Curve of the Pulsating Extreme Helium Star Bd +13°3224: Further Evidence of a Decline in the Period Decrease Rate

Lynas-Gray, A. E.; Kilkenny, D.

doi:10.1007/978-94-009-4744-3_13

A. E. Lynas-Gray³ &
D. Kilkenny⁴

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 128))

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Abstract

Further optical and infrared (J-filter) observations are presented for the extreme helium star BD +13°3224. No infrared excess, which could have been attributed to a cool companion, is found. Very recent times of maximum light confirm the ephemeris cubic term already proposed. Current models for the evolution of BD +13°3224, while approximately accounting for the period decrease rate (\(\dot{P}\) ), do not explain the decreasing \(\dot{P}\) indicated by the cubic term.

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Authors and Affiliations

Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, England
A. E. Lynas-Gray
South African Astronomical Observatory, P.O. Box 9, Observatory, 7935, Cape Town, South Africa
D. Kilkenny

Authors

A. E. Lynas-Gray
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D. Kilkenny
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Editors and Affiliations

Institute for Theoretical Physics and Observatory, University of Kiel, Germany
Kurt Hunger & Detlef Schönberner &
Indian Institute of Astrophysics, Bangalore, India
N. Kameswara Rao

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Lynas-Gray, A.E., Kilkenny, D. (1986). The Light Curve of the Pulsating Extreme Helium Star Bd +13°3224: Further Evidence of a Decline in the Period Decrease Rate. In: Hunger, K., Schönberner, D., Rao, N.K. (eds) Hydrogen Deficient Stars and Related Objects. Astrophysics and Space Science Library, vol 128. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4744-3_13

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DOI: https://doi.org/10.1007/978-94-009-4744-3_13
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8608-0
Online ISBN: 978-94-009-4744-3
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