Spectra of RV Tauri stars in the Large Magellanic Cloud

Details Spectra of RV Tauri stars in the Large Magellanic Cloud Spectra of RV Tauri stars in the Large Magellanic Cloud

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..310..344l&link_type=abstract

Variable Stars in the Local Group, IAU Colloquium 193, Proceedings of the conference held 6-11 July, 2003 at Christchurch, New Z

Astronomy and Astrophysics

Astronomy

4

Scientific paper

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 BaII lines at 455.4 and 493.3 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 catalog confirms and extends earlier findings that only moderate infrared excess occur among this sample of RV Tauri stars.

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