Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17071v&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present a study of interstellar lines observed in the ultraviolet spectra of X-ray binary systems: within our own Galaxy (Her X-1) and towards the Large (LMC X-4) and Small (SMC X-1) Magellanic Clouds. The observations were obtained with the HST/STIS which provides a resolving power of 6 km/s in the wavelength range 1150-1700 Angstroms. Interstellar lines observed in these systems include both high-ionization (C IV; Si III, IV) and low-ionization (Si II; S II; C II; Fe II; O I; C II) species. The absorption line profiles, equivalent widths, absorption velocities, and column densities will be presented. In LMC X-4 and SMC X-1 absorption due to high ion gas at Galactic velocities can be clearly distinguished from absorption associated with the respective Clouds. In SMC X-1 we confirm the presence of a third absorption component which has been previously reported towards SMC sources by Savage and de Boer (1981) using IUE observations with a resolution of 25 km/s. The N V absorption lines in SMC X-1 and LMC X-4 do not contain interstellar components. We have simultaneous X-ray observations of all three systems and consider the residual absorption in Si IV and C IV relative to N V as interesting diagnostics of the ionization of the stellar wind by X-rays.
Boroson Bram
Vrtilek Saeqa
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