VY Sculptoris stars as magnetic cataclysmic variables - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2002

VY Sculptoris stars as magnetic cataclysmic variables

Résumé

We show that the absence of outbursts during low states of VY Scl stars is easily explained if white dwarfs in these systems are weakly magnetized (mu >≈ 5x 1030 G cm3). However, some of the VY Scl stars are observed to have very slow declines to minimum and similarly slow rises to maximum. The absence of outbursts during such intermediate (as opposed to low) states, which last much longer than typical disc viscous times, can be explained only if accretion discs are absent when their temperatures would correspond to an unstable state. This requires magnetic fields stronger than those explaining outburst absence during low states, since white dwarfs in this sub-class of VY Scl stars should have magnetic moments mu >≈ 1.5x 1033 G cm3 i.e. similar to those of Intermediate Polars. Since at maximum brightness several VY Scl stars are SW Sex stars, this conclusion is in agreement with recent claims about the magnetic nature of these systems.
Fichier principal
Vignette du fichier
aa2669.pdf (302.65 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04111059 , version 1 (12-06-2023)

Identifiants

Citer

J. -M. Hameury, J. -P. Lasota. VY Sculptoris stars as magnetic cataclysmic variables. Astronomy and Astrophysics - A&A, 2002, 394, pp.231-239. ⟨10.1051/0004-6361:20021136⟩. ⟨hal-04111059⟩
17 Consultations
21 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More