On the accretion mode of the intermediate polar V1025 Centauri |
| |
| Authors: | Coel Hellier Graham A Wynn David A H Buckley |
| |
| Institution: | Astrophysics Group, School of Chemistry and Physics, Keele University, Keele, Staffordshire ST5 5BG,; Astronomy Group, University of Leicester, Leicester LE1 7RH and; South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa |
| |
| Abstract: | The long white-dwarf spin periods in the magnetic cataclysmic variables EX Hya and V1025 Cen imply that if the systems possess accretion discs then they cannot be in equilibrium. It has been suggested that instead they are discless accretors in which the spin-up torques resulting from accretion are balanced by the ejection of part of the accretion flow back towards the secondary. We present phase-resolved spectroscopy of V1025 Cen aimed at deducing the nature of the accretion flow, and compare this with simulations of a discless accretor. We find that both the conventional disc-fed model and the discless-accretor model have strengths and weaknesses, and that further work is needed before we can decide which applies to V1025 Cen. |
| |
| Keywords: | accretion accretion discs binaries: close stars: individual: V1025 Cen novae cataclysmic variables |
|
|
