Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-05T15:43:23.509Z Has data issue: false hasContentIssue false

Spectra of RV Tauri stars in the Large Magellanic Cloud

Published online by Cambridge University Press:  12 April 2016

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

Alcock, C. et al. 1998, AJ, 115, 1921 Google Scholar
Gaposchkin, S. 1970, Smithsonian Ap. Obs. Special Report 310 Google Scholar
Gehrz, R.D. 1972, ApJ, 178, 715 CrossRefGoogle Scholar
Gehrz, R.D. & Woolf, N.J. 1970, ApJ, 161, L213 Google Scholar
Gilroy, K.K. 1989, ApJ, 347, 835 CrossRefGoogle Scholar
Giridhar, S., Lambert, D.L. & Gonzalez, G. 2000, ApJ, 531, 521 CrossRefGoogle Scholar
Giridhar, S., Rao, N.K. & Lambert, D.L. 1994, ApJ, 437, 476 CrossRefGoogle Scholar
Goldsmith, M.J. et al. 1987, MNRAS, 227, 143 Google Scholar
Lambert, D.L. et al. 1986, ApJS, 62, 373 Google Scholar
Laney, C.D. 1991, in IAU Symp. 148, The Magellanic Clouds, ed. Haynes, R. & Milne, D. (Dordrecht: Reidel), 109 CrossRefGoogle Scholar
Lloyd Evans, T. 1985, MNRAS, 217, 493 CrossRefGoogle Scholar
Lloyd Evans, T. 1999, in IAU Symp. 191, AGB Stars, ed. Le Bertre, T., Lebre, A. & Waelkens, C. (San Francisco: ASP Publications), 453 Google Scholar
Pollard, K.R. & Lloyd Evans, T. 2000, AJ, 120, 3098 Google Scholar
Preston, G.W., Krzeminski, W., Smak, J. & Williams, J.A. 1963, ApJ, 137, 401 Google Scholar
Shetrone, M.D. 2003, ApJ, 585, L45 CrossRefGoogle Scholar
van Winckel, H. 1999, in IAU Symp. 191, AGB Stars, ed. Le Bertre, T., Lebre, A. & Waelkens, C., 465 Google Scholar
Welch, D.L. 1987, ApJ, 317, 672 CrossRefGoogle Scholar