Multiwavelength Systematics of O-Type Spectra

Nolan R. Walborn

Space Telescope Science Institute

Chandra X-Ray Spectroscopy

Workshop, July 11-13, 2007

X-Ray Collaborators: Wayne Waldron, Joy Nichols, Nancy Evans, Nathan MillerOptical/UV Collaborators: Ian Howarth, Danny Lennon, Alex Fullerton

Walborn Diagram

OpticalO MainSequence

N IV/IIIHe II/I

UV O Main Sequence (No Si IV)

UV OB Main Sequence (No Si IV)

OpticalEarly OSupergiantSequence

N IV/III

OpticalOBSupergiantSequence

Si IV/III/II

UV OSupergiantSequence

Si IV!

UV BSupergiantSequence

Si IV!

FUV O Supergiant Sequence (O VI, C III)

Optical O Luminosity Sequence (He II λ4686, N III λ4640)

UV O Luminosity Sequence (Si IV! 45 eV)

FUV O Luminosity Sequence (S IV 47 eV, C III 48 eV, P V 65 eV but low abundance!)

X-Ray OBSupergiantSequence

Si XIV/XIIIMg XII/XINe X/IXO VIII/VII

X-Ray OBMainSequence

Si XIV/XIIIMg XII/XINe X/IXO VIII/VII

X-Ray OLuminositySequences

X-Ray OLuminositySequences

X-Ray OBPeculiarObjects