Long-Term, Multicolor Photometry of Type II Cepheids and Other Variables

Details Long-Term, Multicolor Photometry of Type II Cepheids and Other Variables Long-Term, Multicolor Photometry of Type II Cepheids and Other Variables

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..105t&link_type=abstract

STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin

Computer Science

Databases

Cepheids, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Cosmic Rays

Scientific paper

Long-term, multicolor photometry of W Virginis has revealed the presence of regularly alternating minima, identified as arising from fundamental-first overtone pulsation with a period ratio of P(1) = 2P(0)/3. Such behavior was suspected in W Vir as early as the 1950s, but had not been conclusively identified until now. The presence of an identifiable secondary pulsation mode in the pulsations of this star raises several interesting possibilities for modeling and future observations. Observations of more long-period Type II Cepheids may prove fruitful, particularly as regards the phenomenon of alternating minima; some work has already been done data mining of the MACHO (Pollard et al. 2000) and ASAS (Wils & Otero 2008) databases, and current and upcoming photometric monitoring systems may provide much more useful data on these stars. In this poster, we present a few examples from the long-term photometric program of the AAVSO obtained with the Sonoita Research Observatory in Arizona, with a view toward modeling these interesting stars and their light curves.

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