NDLI: Asca solid state imaging spectrometer observations of o stars

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Asca solid state imaging spectrometer observations of o stars

Content Provider	NASA Technical Reports Server (NTRS)
Author	Macfarlane, J. J. Kitamoto, S. Waldron, W. L. Muira, N. Corcoran, M. F. Pollock, A. M. T. Torrii, K. Ohno, Y. Chen, W. Egoshi, M.
Copyright Year	1995
Description	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.
File Size	388788
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950017965
Archival Resource Key	ark:/13960/t37130d90
Language	English
Publisher Date	1995-02-02
Access Restriction	Open
Subject Keyword	Astronomy Stellar Spectra Imaging Spectrometers Stellar Winds Stellar Envelopes O Stars Emission Spectra X Ray Spectra Line Spectra X Ray Absorption X Ray Sources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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