Infrared excess and extended emission around Cepheids

Details Infrared excess and extended emission around Cepheids Infrared excess and extended emission around Cepheids

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..479g&link_type=abstract

SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,

Astronomy and Astrophysics

Astrophysics

Stars: Circumstellar Matter, Stars: Variables: Cepheids, Infrared: Stars

Scientific paper

We present new thermal IR photometry and spectral energy distributions (SEDs) of the classical Cepheids W Sgr, Y Oph and FF Aql, using newly obtained VISIR thermal IR photometric measurements. We used the BURST mode of the instrument to get diffraction-limited images at 8.59, 11.25 and 11.85 μm. For these three stars, the SEDs show an IR excess at long wavelengths. These excesses are likely extended emissions surrounding the stars linked to a possible mass loss mechanism. We also detected a spatially extended emission around W Sgr and Y Oph while we do not resolve the circumstellar envelope of FF Aql.

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