A search for coronal line emission from early-type stars. I - Zeta Puppis

Astronomy and Astrophysics – Astrophysics

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Early Stars, O Stars, Optical Emission Spectroscopy, Stellar Coronas, Stellar Spectra, Iron, Line Spectra, Stellar Mass Ejection, Stellar Winds, Visible Spectrum, X Rays

Scientific paper

A search is made for [Fe XIV] 5303 Å coronal line emission in the spectrum of ζ Puppis. High signal-to-noise data acquired with a Reticon detector reach the sensitivity levels required to detect the ≅5 mÅ strength line expected for hot corona - cool wind models that fit the Einstein IPC data. A statistically significant line is not detected, however, and the resulting 2σ detection limits (≅1 mÅ) would now seem to eliminate models in which this star's X-ray emission originates predominantly in a base coronal zone. Thus X-ray emission mechanisms operating within and throughout the cool wind are strongly favoured.

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