VX Hya (2011-2012 season) [Observed: 21, 22, 27 Feb, 13 Mar 2012]
Time-series are presented for this pulsating star, after its sudden pulsation change in 2008 and after the 2010-2011 season observations.

VX Hya (2010-2011 season) [Observed: 5, 7, 8 Feb, 4 Mar, 9 Apr 2011]
Time-series are presented for this pulsating star, after its sudden pulsation change in 2008.

VX Hydrae: observation of a sudden change in a pulsating star [Observed: March 2005-April 2010]
Time-series of VX Hya from March 2005 to April 2010 are analyzed. A period jump is discovered to happen in 2008 in all the pulsation modes, being at its strongest for the overtone.

V1412 Aql: a simulation []
A Monte Carlo simulation which may be useful to search for eclipses is proposed.

VZ Lib: a contact binary in a ternary system [Observed: 2007-2009, 14 sessions]
Time series of this eclipsing contact binary are reported and times of minima (ToM) of the eclipses are measured. This system has a third component. From the O-C analysis of the observed ToM and of those in the literature, the orbital parameters of the third body can be derived: the orbital period is 34.8 yr and the inclination is 11.5 °.

CoRoT-1: observations of the exoplanet transits [Observed: 28 Dec 2008, 18, 21 Mar 2009]
Amateur observations of this transiting exoplanet are presented and are modelled with BinaryMaker3.

WASP-2: possible detection of the exoplanet transit [Observed: 5 Aug, 11 Oct 2008]
Amateur observations of this transiting exoplanet are presented and are modelled with BinaryMaker3.

VX Hya (2008-2009) phase variations [Observed: 24, 27, 28 Dec 2008, 29, 30 Jan, 17, 19, 22, 23 Mar 2009]
The strong phase shift that I detected in 2008 is confirmed with new observations.

UX Mon: time keeping and modelling of a binary [Observed: 13 Dec 2007, 11-16, 18 Feb, 8, 13, 14 March, 1, 4, 25, 29]
Time series of this eclipsing binary system with extra variability are presented. The O-C analysis suggests the presence of a third star. The observations are modelled with BinaryMaker3 and parameters of the system are derived.

V1309 Ori: an eclipsing polar [Observed: 26 Dec 2006, 15 Feb, 7 Nov 2007]
A phase plot of this eclipsing polar is presented. I try to model it with BinaryMaker3.

FO Aqr: modeling 4 years of observations [Observed: 12, 17 July, 6 Sept 2007 and 2004-2006]
Time series from 2004 to 2007 of this intermediate polar are fitted with a single analytical function. FO Aqr is then found spinning up with dP/dt=-(1.1 +/- 0.3)*10^-10.

SZ Mon, the double pulsator [Observed: 35 sessions from 23 Dec 2005 to 11 Mar 2007]
Photometry of this pulsating supergiant star (33d period) are presented. The magnitudes are compared with published observations. The measurements are also corrected for a nearby star. Variations of the color, temperature, radius and luminosity are inferred.

KZ Hya: a pulsating binary (improved) [Observed: 9 Feb, 11, 14 March, 19 Apr 2007]
This pulsating star is in a binary system with an 8-yr orbital period. The times of maximum are compared with an improved ephemeris and the parameters of the binary are derived.

FO Aqr: 2006 observations and modeling [Observed: 23, 29 Jun, 20 Sep, 30 Nov 2006]
Time series of this intermediate polar are presented and are modelled.

Stellar structure []
The equations that describe a polytropic star structure are derived.

Pulsating stars II: Solutions at constant density []
The differential equation for a radially pulsating star is solved for a constant density.

Pulsating stars III: Polytropic model []
The solutions to the differential equation of a radially pulsating star are presented for a polytropic model.

BT Mon: eclipser with a hump [Observed: 26 Oct, 1 Nov, 24 Dec 2005, 19 Jan 2006]
Light curves of this cataclysmic star are presented. They show the eclipse with a large hump. They are modelled with BinaryMaker3.

FO Aqr: 2005 observations and modelling [Observations: 10 Oct, 20 Nov, 1, 23 Dec 2005]
Time series of this intermediate polar are presented and are modelled.

W Vir: temperature, radius and radial velocity determinations from B, V photometry [Observed: 16 observing sessions from 27 April to 20 July 2005]
V and B magnitudes measurements are obtained for this Population II Cepheid pulsating star. They are used to compute the variations of temperature, radius and radial velocity. The results are compared with direct measurements from spectroscopy.

VX Hya time keeping [Observations: 10, 11, 13, 16, 17, 18 March 2005]
Time-series for this pulsating star with multiple oscillations are obtained. They are compared with the Fitch (1966) ephemeris: the matching is still good but with a delay of 1.4 hour.

TV Lib: temperature and radius variations from photometry [Observations: 11, 13, 17, 18 March 2005]
Two-color time-series were obtained for this pulsating RR Lyrae star. The pulsation is too early when compared with the ephemeris. The temperature and the radius variations are computed from different models.

SW Sex observation and BinaryMaker3 model [Observations: 10, 11, 14, 15 January 2005]
SW Sex is an accreting binary with deep, non symmetrical eclipses. The observations are modelled with the BinaryMaker3 program.

FO Aqr: 2004 observations and modelling [Observed 29, 30 July, 15, 27, 31 Aug, 1 Sept 2004]
Time series of this intermediate polar are presented and are modelled.