Spitzer Detection of Cepheid Circumstellar Emission

Details Spitzer Detection of Cepheid Circumstellar Emission Spitzer Detection of Cepheid Circumstellar Emission

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..36m&link_type=abstract

"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere

Physics

Cepheids, Infrared: Stars, Stars: Mass Loss

Scientific paper

Our Spitzer Space Telescope survey of nearby Cepheids has revealed for the first time the presence of circumstellar emission at IRAC and MIPS infrared wavelengths. The observed sample includes both long and short period Cepheids, first overtone and fundamental mode pulsators and Cepheids in clusters and in isolation. IRAC and MIPS colors provide an excellent Period-Luminosity relation, and show evidence of a small infrared excess for about 1/4 of the observed targets. This excess may be associated to warm dust (˜ 500~K) in proximity to the star. A few targets, including δ Cep, SZ~Tau and RS~Pup, show extended emission on spatial scales as large as 10^4~AU, whose nature is currently undetermined. This detection of circumstellar material supports the hypothesis of active mass loss during the Cepheids phase.

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