Spitzer Observations of Classical Cepheids

Details Spitzer Observations of Classical Cepheids Spitzer Observations of Classical Cepheids

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1305e&link_type=abstract

American Astronomical Society Meeting 210, #13.05; Bulletin of the American Astronomical Society, Vol. 39, p.112

Astronomy and Astrophysics

Astronomy

1

Scientific paper

There remains a discrepancy between measured masses and masses from evolutionary and pulsation calculations for classical Cepheids. One possible explanation for this is mass loss. We have observed a sample of Cepheids with Spitzer IRAC and MIPS in order to create energy distributions from the optical through the infrared to look for an infrared excess indicative of mass loss. Our sample of 29 Pop I Cepheids and 4 nonvariable supergiants includes a range of mass, luminoisty, pulsation amplitude, and binary status, all of which could influence mass loss. Included in the list are RS Pup and SU Cas both of which are associated with reflection nebulae and were found to have infrared excesses in IRAS data (McAlary and Welch 1986, AJ, 91, 1209). The improved angular resolution and sensitivity of Spitzer IRAC and MIPS will be used to compare stars which were found to have IR excesses in IRAS data and those which did not.
Funding for this work was provided by Spitzer grant 1288762 and Chandra X-ray Center NASA Contract NAS8-39073.

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