Mass Loss from Classical Cepheids and their Progenitors

Details Mass Loss from Classical Cepheids and their Progenitors Mass Loss from Classical Cepheids and their Progenitors

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30666e&link_type=abstract

Spitzer Proposal ID #30666

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Classical Cepheid variable stars are primary extragalactic distance indicators, so accurately understanding and modeling them is vital. There remains a discrepancy between measured masses and masses from evolutionary and pulsation calculations, as evidenced by the recent results on Polaris. One possible explanation is mass loss. The current proposal is to observe a sample of Cepheids with Spitzer in order to determine whether mass loss is the explanation or whether adjustment to the physics of the computations is needed. The target list includes stars with a range in mass, luminosity, pulsation amplitude, and binary status, all of which could influence the level of mass loss. Spitzer observations have the spatial resolution to isolate any Cepheid emission from that of nearby stars or the background.Spectral energy distributions from Spitzer data should fully address the question of mass loss.

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