NASA NTRS · 19830044496
Einstein observations of three classical Cepheids
Abstract
We have looked for X-ray emission from the classical Cepheids delta Cep, beta Dor, and zeta Gem during phases when the latter two stars show emission in low excitation chromospheric lines. No X-ray flux was detected except possibly from zeta Gem at phase 0.26. Derived upper limits are in line with emission flux or upper limits obtained for other F and G supergiants.
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Bohm-Vitense, E., Parsons, S. B.. 1983-03-01. Einstein observations of three classical Cepheids. https://ntrs.nasa.gov/citations/19830044496
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