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Spectra of RV Tauri stars in the Large Magellanic Cloud

Published online by Cambridge University Press:  12 April 2016

Tom Lloyd Evans  and
Karen R. Pollard
Tom Lloyd Evans
Affiliation:
School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, ScotlandKY16 9SS
Karen R. Pollard
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand

Abstract

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Low-resolution (0.6 nm) spectra of 24 RV Tauri stars in the LMC shows that most are of intermediate Preston type, hence intermediate metal deficiency. Two belong to Preston’s class B, with enhanced CH and CN. Higher resolution spectra of the carbon star MACHO 47.2496.8 show that the 12C/13C ratio is high and that the Ball lines at 455.4 and 493.4 nm are enhanced. This suggests that the star has undergone the third dredge-up of helium-burning products on the thermally-pulsing AGB and is now in a post-AGB stage of evolution. JHK photometry from the 2MASS catalogue confirms and extends earlier findings that only moderate infrared excesses occur among this sample of RV Tauri stars.

Type
Part 5. Red Giants, Miras, post-AGB stars and proto-planetary nebulae
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 344 - 347
Copyright
Copyright © Astronomical Society of the Pacific 2004

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