Estimating errors in stellar angular diameters: does the NPOI see the pulsation of delta Cephei?

J. Thomas Armstrong; Robert B. Hindsley; David Mozurkewich; Arsen R. Hajian; Marvin E. Germain; Tyler E. Nordgren

doi:10.1117/12.390263

5 July 2000 Estimating errors in stellar angular diameters: does the NPOI see the pulsation of δ Cephei?

J. Thomas Armstrong, Robert B. Hindsley, David Mozurkewich, Arsen R. Hajian, Marvin E. Germain, Tyler E. Nordgren

Proceedings Volume 4006, Interferometry in Optical Astronomy; (2000) https://doi.org/10.1117/12.390263
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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.

Citation Download Citation

J. Thomas Armstrong, Robert B. Hindsley, David Mozurkewich, Arsen R. Hajian, Marvin E. Germain, and 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); https://doi.org/10.1117/12.390263

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