Mass Loss from Classical Cepheids and their Progenitors II: IRAC Deep Search for Extended Emission

Details Mass Loss from Classical Cepheids and their Progenitors II: IRAC Deep Search for Extended Emission Mass Loss from Classical Cepheids and their Progenitors II: IRAC Deep Search for Extended Emission

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50350f&link_type=abstract

Spitzer Proposal ID #50350

Physics

Scientific paper

Despite their importance as primary extragalactic distance indicators, there are still unresolved mysteries in the understanding and modeling of Classical Cepheids. In particular, there remains a discrepancy between measured masses and masses from evolutionary and pulsational calculations, as evidenced by recent results on Polaris. One possible explanation for this outstanding discrepancy is mass loss. Our GO-3 Spitzer observations of a sample of Classical Cepheids have revealed infrared excess around ~1/3 of our targets. This emission is spatially extended around delta Cep, SZ Tau and RS Pup, and may be the elusive evidence, missing until now, of significant mass loss through the Cepheid phase. To test how common this phenomenon is for the Cepheid phase we propose deep IRAC imaging of all the targets in our GO-3 sample. We will use these deeper and wider field images to search for further extended emission. The frequency of this emission, and the Cepheid characteristics with which it is associated (pulsation amplitude, luminosity, binarity) will provide clues to the source: ongoing mass loss or residual interstellar matter.

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