A search for cool gas in the X-ray emitting wind of O-stars

Details A search for cool gas in the X-ray emitting wind of O-stars A search for cool gas in the X-ray emitting wind of O-stars

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2097r&link_type=abstract

Chandra Proposal ID #08200171

Physics

Chandra Proposal Id #08200171

Scientific paper

Pollock and Raassen developed a new paradigm for X-ray emission in O-stars. It implies that the X-ray emission originates from proton-excitations far out in the wind in an area with non-equilibrium plasma, while generally is assumed that the X-rays are emitted in hot plasma in equilibrium near the stellar surface. We use LETGS spectra to search for this cool gas in O-star wind detectable by CV, OVI, NeVIII, MgVIII-MgX, SiIX-SiXII, SXII, SXIII, FeXVI above 37 Angstrom (the cut-off of XMM-Newton). Our first goal is to identify these cooler (low-ionized) ions upto 80 Angstrom as indication for non-equilibrium plasma. No O-stars have been studied extensively thusfar above 37 Angstrom. Delta Ori is chosen, because of its low interstellar absorption.

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