Abstract
We have detected the companion starinX1822 - 371 from the behaviour of the HeI A5876 in absorption around phase 0.5 and find a lower limit for the radial velocity of Kc > 225±23 kIns- l . The irradiation-induced dominant component within the HeI }'5876 absorption profile is the only detected spectral signature of the companion star. Ha shows a narrow double-peaked emission profile embedded in a wider absorption profile. There is no evidence of any binary motion (i.e., rotational disturbance during eclipse) probably implying a vertically extended region obscuring the inner disc. The Ha emission distribution is centred towards the disc bulge at phase 0.8 rather than towards the compact object. Detection of Fe II A6516, in the region of phase 0.8, suggests an 'iron-curtain' related to the impact region of the gas stream with supersonic velocities of Mach -20 ± 8(T/104 K) for the absorbing gas.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
