Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50346m&link_type=abstract
Spitzer Proposal ID #50346
Computer Science
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 though the Cepheid phase. To confirm this hypothesis, we propose to obtain IRS spectral maps in key positions around the three Cepheids where the emission was spatially resolved by Spitzer. These observations will clarify the nature and composition of the circumstellar material, and discriminate between its two possible origins: ongoing mass loss or residual interstellar matter.
Barmby Pauline
Bono Giuseppe
Engle Scott
Evans Nancy
Guinan Edward
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