The AXAF low-energy transmission grating spectrometer LETGS - Diagnostic capabilities for the study of stellar coronae

Details The AXAF low-energy transmission grating spectrometer LETGS - Diagnostic capabilities for the study of stellar coronae The AXAF low-energy transmission grating spectrometer LETGS - Diagnostic capabilities for the study of stellar coronae

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.182...35m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 182, no. 1, Aug. 1991, p. 35-59. Research supported by SRON and Lockheed I

Astronomy and Astrophysics

Astrophysics

9

Astronomical Spectroscopy, Gratings (Spectra), Spectrometers, Stellar Coronas, X Ray Astrophysics Facility, Abundance, Binary Stars, Emission Spectra, Exosat Satellite, Spectrum Analysis, Stellar Flares

Scientific paper

The diagnostic capabilities of the high-resolution, Low-Energy Transmission Grating Spectrometer, LETGS, of NASA's planned Advanced X-ray Astrophysics Facility, AXAF, for optically thin stellar coronae are studied. Spectra are simulated on the basis of isothermal and source loop models and are analyzed with particular emphasis on the extraction of the differential emission measure distribution. The AXAF-LETGS is shown to be particularly sensitive for plasma at temperatures between 0.5 and 15 MK. Emission from temperatures in excess of 20 MK can be observed, but the lack of strong spectral lines hampers accurate temperature determinations. Spectra of close binaries to demonstrate the observability of the Doppler effects associated with orbital motions are simulated. Lists of spectral lines that can be used for density diagnostics are presented and simulated and compared with various spectra at different electron densities.

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