Long baseline interferometric observations of Cepheids

Details Long baseline interferometric observations of Cepheids Long baseline interferometric observations of Cepheids

2002-03-05

arxiv.org/abs/astro-ph/0203060v2

Astronomy and Astrophysics

Astrophysics

22 pages, 5 figures. Accepted for publication in ApJ

Scientific paper

10.1086/340558

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.

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