Observations of Cepheids with Spitzer

Details Observations of Cepheids with Spitzer Observations of Cepheids with Spitzer

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541706h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #417.06; Bulletin of the American Astronomical Society, Vol. 42, p.271

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Scientific paper

Classical Cepheid variable stars have remained important indicators of extragalactic distance and Galactic evolution since the discovery of the Leavitt Law in 1908. The Spitzer Space Telescope has opened the possibility of extending the study of Cepheids into the infrared, where interstellar extinction is reduced. We have obtained photometry from images of a sample of Galactic Cepheids with the IRAC instrument on Spitzer. Here we present mid-infrared period-luminosity relations for Classical Cepheids in the Galaxy. We find a significant period-color relation for the [3.6] - [8.0] IRAC color. Other mid-infrared colors for Cepheids are strongly affected by variable molecular spectral features, in particular deep CO absorption bands. We discuss the extended emission around RS Pup, l Car, δ Cep, RT Aur, S Mus and T Mon and whether it might be associated with stellar mass loss. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.

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