Soft X-ray emission lines from low-mass X-ray binaries. I - Collision-dominated models

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Emission Spectra, Stellar Mass Accretion, X Ray Binaries, Heao 2, Line Spectra, Stellar Coronas, Stellar Evolution, Stellar Mass

Scientific paper

The soft X-ray line emission from five low-mass X-ray binaries observed by the Einstein Observatory (HEAO 2) Objective Grating Spectrometer is examined. Observed spectra are fitted to model spectra consisting of emission from an optically thin plasma. Fits are performed using a variety of different assumptions for elemental abundances, heating and ionization mechanisms, and the distribution of gas temperature and ionization parameter. The results are discussed in the context of current models for the accretion flow in low-mass X-ray binaries.

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