EX Hya outburst (22, 24 May 2010)
A light curve of this cataclysmic system in outburst is reported.
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 (2007-2009)
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 °.
BG CMi spin-up and eclipses
(29 Mar, 27 Dec 2008, 29 Jan, 3, 16 Mar 2009)
Time-series obtained in 2008-2009 for this eclipsing intermediate
polar are presented, showing pulsations from the white dwarf. With other
time-series obtained in 2005-2007, an ephemeris is derived, and the period
is found decreasing at the rate dP/dt=-(1.4+/-0.4)*10^-11, not as strong
as what was reported from earlier observations.
The ephemeris for the orbital period is also improved.
The orbital phase plot shows a stronger emission on the egress side and I
try to interpret it.
CoRoT-1: observations of the exoplanet transits
(28 Dec 2008, 18, 21 Mar 2009)
Time-series are presented and are modelled with BinaryMaker3.
329 Svea light/rotation curve (16, 17, 18, 19, 21, 22 Mar 2009)
Time-series are obtained for this asteroid. A period of rotation
of 22.53 h is derived using a Monte Carlo algorithm.
VX Hya (2008-2009) phase variations (2, 27, 28 Dec 2007,
29, 30 Jan 2009)
The strong phase shift that I detected in 2008 is confirmed with new observations.
IQ Eri: a cataclysmic in outburst (27, 28 Dec
2008)
Light curves are presented.
UX Mon: time keeping and modeling of a binary (Dec 2007-Apr 2008)
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 modeled
with BinaryMaker3 and parameters of the system are derived.
V1432 Aql time keeping (28 June, 22 July, 6, 30 August 2008)
Light curves for this asynchronous polar are presented.
They show the eclipses and the spin modulation. They are compared with
ephemerides.
V1309 Ori: an eclipsing polar (26 Dec 2006, 15 Feb, 7 Nov 2007)
A phase plot of this eclipsing polar is presented. I try to model it with BinaryMaker3.
ASAS1826+12, the eclipsing Cepheid (July-Nov 2007)
Multicolor photometric measurements of this Cepheid in an eclipsing
binary system (the only known one in our galaxy) are presented.
EH Lib follow-up (24 Apr, 7, 12 July 2007)
Time series of this DSCT pulsating star with a period of 2.1h are presented
and compared with 2004-2005 observations.
Occultation by asteroid 329 Svea (7 Nov 2007)
The minor planet 329 Svea was observed occulting a 11.54 mag star:
the size of the shadow flying over my location was 68.8+/-1.8km.
AO Psc: modeling 4 years of observations (2004-2007)
Time series from 2004 to 2007 of this intermediate polar are fitted
with a single analytical function. AO Psc is then found spinning up with
dP/dt=-(4.3 +/- 2.3)*10^-11.
FO Aqr: modeling 4 years of observations (2004-2007)
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.
Feige 7: a rotating white dwarf (Oct-Dec
2006)
A phase plot for this rotating (period 2.2h), magnetic, lone white dwarf is presented.
TX Mon: a Cepheid radius variations (Mar 2006-Mar 2007)
B,V photometry measurements of this Cepheid are presented. The distance,
temperature and radius of this pulsating star are computed.
SZ Mon: a double pulsator (Dec 2005-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) (Feb-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.
SDSS J0407: an eclipsing cataclysmic (Nov 2006-Jan
2007)
Time series for this deeply eclipsing cataclysmic
system are presented.
AO Psc: 3 years of time keeping
(23 July, 22 Aug, 15 Oct, 1 Dec 2006)
Observations in 2006 of this magnetized cataclysmic system are presented
and are modeled with a synodic oscillation, a spin oscillation and an
orbital modulation.
Observations in 2004-2006 are compared with the ephemeris.
M11: open cluster distance measurement (23 June 2006)
The M11 open cluster (Wild Duck cluster, NGC6705) is observed through
B and V filters. An HR diagram is constructed. It is compared
with an absolute HR diagram made from Hipparcos data which measured the
parallaxes of nearby stars. The distance to M11 is then derived. The interstellar
extinction is taken into account using the Henden's sequence for M11 (U data).
THEORY Mach's
principle and evolution of the Universe
Within the framework of Mach's principle and of D.W. Sciama's physical
interpretation of it, a quantitative evaluation of the inertial mass as
a function of the density of the universe and of the epoch is obtained.
The calculation is somewhat similar to the solution of Olbers's paradox.
The result shows that the inertial mass varies as the universe expands
except for a flat, Euclidean universe. This leads to insights on the Principle
of Equivalence.
UPDATE BT Mon, an eclipser with a hump (26 Oct, 1 Nov, 24 Dec 2005, 19 Jan 2006)
Time series showing the eclipse with a large hump are presented.
They are modelized with BinaryMaker3.
CK Aqr, a contact binary star (8 sessions in July-Nov 2005)
Time series are presented and modelized with BinaryMaker3.
335 Roberta rotation curves (30 Sept, 9 Oct 2005)
Rotation curves of this asteroid are presented.
W Vir: temperature, radius and radial velocity
determinations from B, V photometry (27 Apr-20 Jul 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.
AE Aqr flares (and HX Aqr) (29, 30, 31 Aug 2005)
Time-series of this intermediate polar were carried out with B and V filters.
Flares were observed with strong color changes.
2003 UB313: Solar System new planet (5 and 9 Aug 2005)
Observations with a 20 cm telescope and an animation.
TV Lib: temperature and radius variations
from photometry (11, 13, 17, 18 March 2005)
Two-color time-series of this pulsating RR Lyrae are obtained. The
pulsation is checked against the ephemeris. The temperature and radius
variations are computed from several models.
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