Other
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995arcl.rept.....c&link_type=abstract
Final Report, 4 Feb. 1994 - 31 Jan. 1995 Applied Research Corp., Landover, MD.
Other
Emission Spectra, O Stars, Stellar Spectra, Stellar Winds, X Ray Absorption, X Ray Spectra, Imaging Spectrometers, Line Spectra, Stellar Envelopes, X Ray Sources
Scientific paper
We report ASCA Solid State Imaging Spectrometer (SIS) x-ray observations of the O stars delta Ori and lambda Ori. The energy resolution of the SIS allows us to resolve features in the O star x-ray spectra which are not apparent in spectra obtained by x-ray spectrometers with lower energy resolution. SIS spectra from both stars show evidence of line emission, suggesting the thermal nature of the x-ray source. However, the observed line strengths are different for the two stars. The observed stellar x-ray spectra are not well described by isothermal models although absorbed thermal emission models with two or more temperatures can provide an adequate fit to the data. For both stars we present evidence of absorbing columns significantly larger than the known ISM columns, indicative of absorption by a circumstellar medium, presumably the stellar winds. In addition, the lambda Ori spectrum shows the presence of emission at energies greater than 3 keV which is not seen in the delta Ori spectrum.
Chen Wei
Corcoran Michael F.
Egoshi M.
Kitamoto Shunji
MacFarlane Joseph J.
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