5 July 2000 Estimating errors in stellar angular diameters: does the NPOI see the pulsation of δ Cephei?
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Abstract
We examine our measured Cepheid diameters and the uncertainties as estimated from observations of calibrators and check stars, using (delta) Cephei, for which we have the most data, as our example. The mean limb-darkened diameter of (delta) Cep is 1.520 +/- 0.014 mas. The pulsation is only weakly seen, if at all, a tantalizing result that however does not determine the distance with useful precision. The longer baselines currently under construction will provide both high-precision diameters and a post-facto check of our uncertainty estimates.
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J. Thomas Armstrong, Robert B. Hindsley, David Mozurkewich, Arsen R. Hajian, Marvin E. Germain, Tyler E. Nordgren, "Estimating errors in stellar angular diameters: does the NPOI see the pulsation of δ Cephei?", Proc. SPIE 4006, Interferometry in Optical Astronomy, (5 July 2000); doi: 10.1117/12.390263; https://doi.org/10.1117/12.390263
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KEYWORDS
Calibration

Stars

Error analysis

Interferometers

Visibility

Photometry

Atmospheric corrections

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