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OeBe-stars with possible compact companions observed at X-rays

Published online by Cambridge University Press:  07 August 2017

E.J.A. Meurs
Affiliation:
Dublin Institute for Advanced Studies, School of Cosmic Physics, Ireland
A.J.M. Piters
Affiliation:
Dublin Institute for Advanced Studies, School of Cosmic Physics, Ireland

Abstract

A survey of bright O- and B-type stars has been conducted from the ROSAT All Sky Survey data, aiming at the detection of compact companions expected for Oe and Be stars. Concurrent Hα spectroscopy has been used to establish the level of activity of these stars around the time of the X-ray observations. The detection rate of OB and OeBe stars as well as their average X-ray over bolometric luminosities suggest little difference between these two groups of objects. Instead of accretion onto a compact object (NS, WD), the X-ray emission from OeBe stars may be produced by stellar winds as has been proposed for O- and early B-type stars in general. Flexibilities in the available models for X-ray emission from accreting WDs may allow the X-ray emission from such objects to remain below a detectable level. These investigations are now being extended to pointed observations in the ROSAT Archive.

Type
Session VIII - Hydrodynamics and high-energy physics of winds accreting on neutrons stars and black holes
Copyright
Copyright © Kluwer 1995 

References

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