Of+ Type Super-Giant Star Spectroscopy
Jim Ferreira, Livermore CA   bakerst@comcast.net

Massive O type stars are particularly interesting objects spectroscopically, even at low resolution.  The very hot Of+ type stars are the progenitor of Wolf-Rayet stars, though, some will go supernova before reaching the WR phase.  As early O stars, typically >50 solar masses, evolve into super-giant stars their stellar winds increase and lines for NIII, HeII and Ha go to strong emission.  These stars have used up H in their cores and have begun burning He so temperatures can exceed 50,000K.  With rising temperature the stars begin to throw off their outer atmosphere, eventually exposing the hot He burning core as they enter the Wolf-Rayet phase.

Alpy 600 on C9


Spectra Of+ type star HD15570, Alpy 600
Spectra of Of+ type star HD15570, Alpy 600


HD16691 Of+ spectra, Alpy 600
Spectra of Of+ type star HD16691, Alpy 600


Spectra Of+ type star HD14947, Alpy 600
Spectra of Of+ type star HD14947, Alpy 600


Spectra Of type star HD108, Alpy 600
Spectra of Ofpe type star HD108, Alpy 600


HD15629 Of star spectra, Alpy 600
Spectra of O(f) type star HD15629, Alpy 600


HD17603 Of spectra, Alpy 600
Spectra of Of type star HD17603, Alpy 600
More on HD17603 can be found at:  http://www.lafterhall.com/Spectroscopy_O75Ib(f)-star_HD17603.html


HD17505 Of spectra, Alpy 600
Spectra of Of type star HD17505, Alpy 600


HD34656 Of spectra, Alpy 600
Spectra of Of type star HD34656, Alpy 600


HD18801, 9-Sge, spectra, Alpy 600
Spectra of Of type star HD18801, Alpy 600


HD15558 O5 III(f) spectra, Alpy 600
Spectra of Of type star HD15558, Alpy 600


Of type star spectra, Alpy 600
Of type star spectra, class 07.5 to 04.0 showing change in ratio between He II @ 4541 and He I @4471, Alpy 600

Of type star spectra comparison, Alpy 600
Of type stars, 4300-4900 Angstrom, Alpy 600


Line broadening in Of type star spectra, Alpy 600
Spectral line broadening of H-alpha line in Of type supger giant stars, Alpy 600 / C9@f/6.3

Of+ star, HD191612, Alpy 600
Spectra of Of type star HD191612, Alpy 600
Of+ star, HD191612, Alpy 600


68 Cyg, HD203064 spectra, Alpy 600
Spectrum of Of type star 68 Cyg (HD203064), Alpy 600


Of+ / WN5 Wolf-Rayet comparison spectra, Alpy 600
Comparison of spectra for WN5 Wolf-Rayet star and Of+ super giant star, Alpy 600

Of+ type star spectra
O4 If+ and O5 If+ super giant star spectra, Alpy 600

Of+ type stars, diffuse interstellar bands, Alpy 600
Diffuse interstellar bands (DIB), particularly prominent @ 4429 Angstroms, spectra of Of+ super-giant stars

Of+ type stars, diffuse interstellar bands, Alpy 600
Of+ type dwarf stars, HD46223, HD46150, HD47839, Alpy 600 spectrograph

Of+ star spectra
Of dwarf and sub-dwarf type star spectra, Alpy 600

Of+ star spectra
O((f)) dwarf star spectra, Alpy 600



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