The Correlation Between the Photometric Variability and Spectra of Seven RV Tauri and Semi-Regular Stars

Details The Correlation Between the Photometric Variability and Spectra of Seven RV Tauri and Semi-Regular Stars The Correlation Between the Photometric Variability and Spectra of Seven RV Tauri and Semi-Regular Stars

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734213n&link_type=abstract

American Astronomical Society, AAS Meeting #217, #342.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

RV Tauri and Semi-regular variables are difficult to study because some of their behavior is non-periodic. It is believed they are in transition from the AGB to white dwarfs, but this evolution is not very well understood. We have initiated a multi-year study of their behavior in order to better understand the relationships between their period and luminosity and other observational quantities as well as establishing any correlations between pulsation phase and stellar properties. We present our preliminary results for seven stars, 3 RV Tauri and 4 Semi-regulars, obtained by studying the relationships and patterns, or lack thereof, between the variability of their light curves and corresponding changes in their spectra. The seven stars include R Sct, g Her, EU Del, Z UMa, V Vul, SX Her, and AC Her. The AAVSO International Database is the source of our photometric data. Our spectra come from a long term observing program organized by S. Howell using the Coude Feed Telescope at Kitt Peak National Observatory. Support for this work was provided by the NSF PAARE program to South Carolina State University under award AST-0750814. We thank the director of KPNO for his generous allocation of telescope time for this project over the years.

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