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2MASS Two Micron All Sky Survey

a distance between star centers, “orbital separation”

a1, a2 distance from the center of the primary/secondary star to the center of gravity Ai surface area of a surface element

Ai(φ) projected surface area of a surface element

∆Ai accumulated change of the projected surface area of the i-th surface element ADS Astrophysics Data System

B magnetic field strength

c speed of light, c= 299 792 458 km s−1 CV cataclysmic variable binary star CVcat catalogue of CVs

CVMOD CV model code of this work d, d0 number of dimensions

Di default image intensity of the i-th surface element DBI/DBD database interface/database driver

EM eclipse mapping

EUVE Extreme Ultraviolet Explorer FOEM full-orbit eclipse mapping

FWHM full width at half maximum, in case of a Gaussian:

FWHM= √

8 ln 2·σ≈2.355·σ

F observed flux

Fλ observed flux at wavelength λ

FORS2 FOcal Reducer/low dispersion Spectrograph at the VLT FOS Faint Object Spectrograph on the HST

G gravitational constant, G = 6.672 59(85)·108cm3g1s2 GHRS Goddard High Resolution Spectrograph on the HST HIT High Time Resolution modes for FORS2

119

HST Hubble Space Telescope HTML Hypertext Markup Language HTTP Hypertext Transfer Protocol

i inclination

i, j counters

~I vector holding all surfaces’ intensities Ii intensity of the i-th surface element

Ii,λ intensity of the i-th surface element at wavelength λ K amplitude of the orbital velocity variation

L1 inner Lagrangian point

m number of reconstructed dimensions M total system mass

M1, M2 primary/secondary mass M solar mass, M = 1.989e33 g

r distance from the center of the magnetic dipole

r1, r2 distances from the primary/secondary star to a given position (x, y, z) R radius of a star

TWIN two channel spectrograph at the 3.5 m Calar Alto telescope

v velocity

V velocity derived from the Doppler shift of a spectral line V visible surface area

V(φ) set of the visible surface elements at phase φ

UV ultraviolet

VLT Very Large Telescope at Cerro Paranal VLTI Very Large Telescope Interferometer

121 VLT UT2 Telescope #2 of the VLT

VSNET Variable Star Network

WD white dwarf

x, y, z spatial positions

˙

x,y,˙ z˙ velocities

¨

x,y,¨ z¨ accelerations

α angular size

α angle between the dipole axis and a position β dipole axis tilt

∆ smooth width for the default image calculation γ systemic velocity

λ wavelength

λ parameter controlling the contribution of the entropy to the quality of a fit µ (M1+M2)/M1, inverse mass fraction of the primary star

ϕ angle around the dipole

φ orbital phase

φ0 phase offset

Φ Roche potential

Ψ dipole axis azimuth

ΨS azimuth of the stagnation region

σ standard deviation or width parameter of a Gaussian (see also FWHM) χ2 sum of squared residuals

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