SIMBAD references

2020MNRAS.494..425R - Mon. Not. R. Astron. Soc., 494, 425-441 (2020/May-1)

When the disc's away, the stars will play: dynamical masses in the nova-like variable KR Aur with a pinch of accretion.

RODRIGUEZ-GIL P., SHAHBAZ T., TORRES M.A.P., GANSICKE B.T., IZQUIERDO P., TOLOZA O., ALVAREZ-HERNANDEZ A., STEEGHS D., VAN SPAANDONK L., KOESTER D. and RODRIGUEZ D.

Abstract (from CDS):

We obtained time-resolved optical photometry and spectroscopy of the nova-like variable KR Aurigae in the low state. The spectrum reveals a DAB white dwarf (WD) and a mid-M dwarf companion. Using the companion star's i-band ellipsoidal modulation we refine the binary orbital period to be P = 3.906519 ± 0.000001 h. The light curve and the spectra show flaring activity due to episodic accretion. One of these events produced brightness oscillations at a period of 27.4 min, that we suggest to be related with the rotation period of a possibly magnetic WD at either 27.4 or 54.8 min. Spectral modelling provided a spectral type of M4-5 for the companion star and T1=27 148±496 K, logg=8.90 ±0.07, and log(He/H)= -0.79+0.07–0.08 for the WD. By simultaneously fitting absorption- and emission-line radial velocity curves and the ellipsoidal light curve, we determined the stellar masses to be M1=0.94+0.15^–0.11 M and M2=0.37+0.07^–0.07M for the WD and the M-dwarf companion, respectively, and an orbital inclination of 47+1 o-2^ o^. Finally, we analyse time-resolved spectroscopy acquired when the system was at an i-band magnitude of 17.1, about 1.3 mag brighter than it was in the low state. In this intermediate state, the line profiles contain an emission S-wave delayed by ≃0.2 orbital cycle relative to the motion of the WD, similar to what is observed in SW Sextantis stars in the high state.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - binaries: close - stars: fundamental parameters - stars: individual: KR Aur - novae, cataclysmic variables

Simbad objects: 18

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2020MNRAS.494..425R and select 'bookmark this link' or equivalent in the popup menu


2021.10.23-17:29:38

© Université de Strasbourg/CNRS

    • Contact