Long baseline interferometric observations of Cepheids

Abstract

We present observations of the galactic cepheids eta Aql and zeta Gem. Our observations are able to resolve the diameter changes associated with pulsation. This allows us to determine the distance to the Cepheids independent of photometric observations. We determine a distance to eta Aql of 320 +/- 32 pc, and a distance to zeta Gem of 362 +/- 38 pc. These observations allow us to calibrate surface brightness relations for use in extra-galactic distance determination. They also provide a measurement of the mean diameter of these Cepheids, which is useful in constructing structural models of this class of star.

22 pages, 5 figures. Accepted for publication in ApJ

References in corpus (3)

• Fundamental parameters of Cepheids. V. Additional photometry and radial velocity for southern Cepheids
• Calibration of the Barnes-Evans relation using interferometric observations of Cepheids
• The angular diameter and distance of the Cepheid Zeta Geminorum

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