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Article Contents
1 Introduction
2 VHE ${\gamma }$-ray opacity around massive stars
3 Gamma-ray absorption in LS 5039
4 Gamma-ray absorption in LSI +61 ${\hbox {$^\circ $ }}$303 and PSR B1259-63
5 LS 5039 and LSI +61 ${\hbox {$^\circ $ }}$303: opacity in a jet?
6 Effect of pair production
7 Conclusion
Appendix A: Calculation of ${\gamma }$-ray absorption in a massive X-ray binary system
References
List of figures
Copyright ESO 2006
Published by EDP Sciences