VX Hya [Observed: 5, 7, 8 Feb 2011]
Time-series are presented for this pulsating star, after its sudden pulsation
change in 2008.
EX Hya [Observed: 9 Feb 2011]
A light curve for this cataclysmic star, classified as both IP and NL,
is presented and compared with the ephemeris, after its May 2010 outburst.
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.
EX Hya outburst [Observed: 22, 24 May 2010]
A light curve of this cataclysmic system in outburst is reported.
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 °.
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.
IQ Eri: a cataclysmic in outburst [Observed: 27, 28 Dec 2008]
Time series for this cataclysmic variable in outburst are presented.
VX Hya (2008) free fall? [Observed: 7-13 Feb 2008]
Time-series for this pulsating star with multiple oscillations
are obtained. They are compared with the ephemeris of Fitch (1966): they
are too early by 3.7 hours. This is a strong change from previous, recent
observations.
HV Vir outburst [Observed: 14, 15 Feb 2008]
This UGWZ cataclysmic was reported as being in outburst.
Time-series of the beginning of the outburst, showing double peaks,
are reported.
VX Hya long term variability [Observed: 24, 25, 26, 27 Dec 2006]
Time-series for this pulsating star with multiple oscillations
are obtained. They are compared with the ephemeris of Fitch (1966): there
is a delay of 1.2 hour. I also compile various observations and derive
an O-C diagram from 1954 to 2007.
KU Her: a slow irregular variable [Observed: 12, 13, 14, 15, 19 July, 5, 18 Aug, 5, 6, 12, 15, 19, 20 Sept,]
Multicolor photometry of this irregular variable star are presented.
ASAS1826+12: the eclipsing Cepheid [Observed: 7, 12, 13, 14, 15, 17, 19 July, 5, 18 Aug, 5, 6, 12, 15, 19,]
Multicolor photometric measurements of this Cepheid in an eclipsing
binary system (the only known one in our galaxy) are presented.
AE Aqr flares (and HX Aqr) [Observed: 29, 30, 31 Aug 2005]
Time-series of this unusual cataclysmic star were obtained with
B and V filters. Flares were observed, with strong color changes.
KZ Hya time keeping [Observations: 25, 27 April, 18, 19 May 2004]
Three pulses are observed for this SX Phe pulsating star. They
are 29 mn late from the 29 yr old GCVS ephemeris.
EX Hya [Observed: 19, 23, 24, 29 May, 6 June 2004]
Light curves for this cataclysmic star, classified as both IP and NL, are presented and compared with the ephemeris.
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.