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GK Car and GZ Nor: Two low-luminous, depleted RV Tauri stars

Published online by Cambridge University Press:  30 December 2019

I. Gezer ,
H. Van Winckel ,
R. Manick  and
D. Kamath
I. Gezer
Affiliation:
Nicolaus Copernicus Astronomical Center, Rabiańska 8, 87-100 Toruń, Poland Astronomy and Space Science Department, Ege University, 35100 Bornova, Izmir, Turkey
H. Van Winckel
Affiliation:
Institute of Astronomy, KU Leuven, Celestijnenlaan, 200D 3001 Leuven, Belgium
R. Manick
Affiliation:
Institute of Astronomy, KU Leuven, Celestijnenlaan, 200D 3001 Leuven, Belgium
D. Kamath
Affiliation:
Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2100, Australia Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia
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Abstract

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RV Tauri stars are luminous population II Cepheids which show a characteristic light curve of alternating deep and shallow minima. There are 126 RV Tauri variables in our Galaxy. Using WISE [3.4]-[4.6], [12]-[22] diagram we show that Galactic RV Tauri stars show three main types of IR properties in their SEDs; disc-type, non-IR and uncertain, which does not show a clear characteristic in the SED. We also show that there is a strong correlation between disc-type SED and binarity (Gezer et al. 2015). RV Tauri stars were linked to post AGB stars in early studies (Jura 1986), however, recent studies show that their evolutionary nature is more complex than previously thought (Kamath & Van Winckel 2014, and Manick et al. 2018). In this study, we intentionally selected two RV Tauri stars, GK Car (disc-type) and GZ Nor (uncertain), with different IR characteristics to compare their chemical and photometric properties.

Keywords

stars: AGB and post-AGBstars: abundancesstars: variables: Cepheids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 404 - 405
Copyright
© International Astronomical Union 2019 

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