[en] Delt Ori is the nearest massive, single-lined eclipsing binary (O9. II+OB, $P=5^{d}.7324$). High resolution X-ray spectrometry combined with high-precision photometry from space offers a unique opportunity to geometrically measure the dynamics of the shocked gas around the primary star. We summarize our recent campaign of phase-constrained high-resolution X-ray spectra obtained with the CHANDRA/HETGS plus high-precision optical photometry with MOST. These observations provide local measurement of the distribution of the embedded, X-ray emitting shocks in the wind of an O star via radial velocity variations and occultation effects, along with standard $f/i$ ratio diagnostics, and enable us to look for correlations with the broad-band photometric variability. We discuss how these observations can help determine the primary star's clumping-corrected mass loss rate, and resolve critical uncertainties in our understanding of the connection between stellar and mass loss parameters.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Corcoran, Michael F.; USRA ; NASA-GSFC
Nichols, J. S.; SAO
Moffat, A. F.; University of Montreal, Canada
Richardson, N.; University of Montreal, Canada
Pollock, A.; ESA, Spain
Gull, T. R.; USRA
Hamaguchi, K.; USRA ; University of Maryland
Russell, C. M.; Hokkai-Gakuen University, Japan
Evans, N. R.; SAO
Owocki, S. P.; University of Delaware
Waldron, W. L.; Eureka Scientific
Hoffman, J. L.; University of Denver
Lomax, J. R.; University of Oklahoma
Gayley, K. G.; University of Iowa
Oskinova, L.; Universitat Potsdam, Germany
Hamann, W.; Universitat Potsdam, Germany
Iping, R.; USRA ; University of Maryland
Ignace, R.; East Tennessee State University
Nazé, Yaël ; Université de Liège - ULiège > GAPHE : Astrophysique observationnelle (sol et espace)
