Self-Correlation Analysis of RV Tauri Stars and Related Objects

Details Self-Correlation Analysis of RV Tauri Stars and Related Objects Self-Correlation Analysis of RV Tauri Stars and Related Objects

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115...59p&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 803, pp. 59-66.

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Stars: Agb And Post-Agb, Stars: Late-Type, Stars: Variables: Other

Scientific paper

We have used self-correlation-a simple form of variogram analysis-to study 33 RV Tauri and related stars in the LMC, using MACHO data. We confirm the periods and classifications of Alcock et al. and discuss a few stars of special interest. We find that self-correlation is a useful adjunct to Fourier analysis, especially for stars whose classification is based on their cycle-to-cycle behavior. In particular, it can identify stars whose behavior is more complicated than the standard ``alternating deep and shallow minima'' and begin to investigate the question of whether the Population II Cepheids, the RV Tauri variables, and the SRd variables form a continuous sequence from periodicity to irregularity. Our results also emphasize that the RV Tauri phenomenon has two dimensions: the relative depths of adjacent minima and the number of cycles over which the alternating minima persist.

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