Thermal infrared observations of Cepheid envelopes with VLT/VISIR

Details Thermal infrared observations of Cepheid envelopes with VLT/VISIR Thermal infrared observations of Cepheid envelopes with VLT/VISIR

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170...90g&link_type=abstract

STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin

Physics

Cepheids, Pulsars, Fourier Analysis

Scientific paper

We present here our recent results obtained using the mid-infrared imaging instrument VISIR at the ESO VLT. Using a combination of short exposures and ``lucky imaging,'' we obtained diffraction limited (for an 8 m telescope) images of Cepheids. We detected circumstellar envelopes (CSE) both photometrically and spatially, at a fraction of an arcsecond scale. These CSE, most probably due to mass loss, represent a significant bias to distance determination using Baade-Wesselink methods and using surface brightness of interferometric method. This observational study is part of multi instruments/technics effort we are carrying over to detect and characterize CSE.

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