Polarimetry, spectroscopy and modelling of the polar V348 Pav
Abstract
In this talk, we present the physical and geometrical properties of the polar V348 Pav using optical spectroscopic, photometric and polarimetric data. This object has a high level of circular polarization, reaching around 30%, and a high HeII 4686AA to H Beta line ratio, confirming it is a polar. We determined an orbital period of 79.98 min, close to the orbital period minimum of CVs. Doppler tomography showed that most of the spectral line emission in this system is originated in the X-ray heated surface of the companion star. To model the rotational modulation of flux and polarization in four optical bands, we use the Cyclops code that solves the shock structure and then calculates the radiative transfer in the post-shock region emitting by the cyclotron mechanism. This modelling combined with the radial-velocity curve of the companion star indicates a WD magnetic field of ∼28 MG, a WD mass of ∼0.85M, and a low (∼25°) orbital inclination. These values for the WDmass and orbital inclination are consistent with the measured radial velocities.
- Publication:
-
Compact White Dwarf Binaries
- Pub Date:
- September 2019
- Bibcode:
- 2019cwdb.confE..48R