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1.54m telescope at La Silla, ESO, Chile |
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Research
Fundamental parameters of stars
The
French-led CoRoT satellite mission was launched in December 2006. There
are two main goals of the mission: (1) Detection of the properties of
small extra-solar planets and (2) detailed studies of the interiors of
stars by studying their pulsation. I am involved in this work due to my
expertise in the determination of the fundamental parameters of stars
(effective temperature, surface gravity, and metallicity). I use the software package VWA to make these detailed analyses.
Abundance analysis of
binary stars
In collaboration with Jens Viggo Clausen
(DEN) and Guillermo Torres (USA) we have completed the abundance
analysis of both entangled and disentangled spectra of three solar-like
SB2 binary systems (WZ Oph, AD Boo, VZ Hya). Our analysis shows that the best results are
obtained with the disentangled spectra. It requires several (at least 10)
spectra taken at different points in the orbit to be able to
disentangle the spectra properly.
Observations from Dome C
In collaboration with the Small-IRAIT team from Italy, I am
analysing photometric data from Dome C on the Antarctic plateau. We
will ascess the quality of the data from the 25cm telescope. An
immediate advantage of the data from Dome C is that the night is over
three months long in the middle of winter. Runa Biguglio collected
observations of the eclipsing binary Psi Cen in three filters and I am
now processing the data.
Asteroseismology
with WIRE In
1999 the NASA satellite WIRE was launched. The main experiment failed,
but the 52mm star tracker has been used to monotor bright "naked-eye
stars", covering most of the Hertzsprung-Russell diagram. My work is
done in collaboration with a number of people, e.g. Derek L. Buzasi
(USAFA, USA), John Southworth (Warwick, UK), Jens Viggo Clausen
(Copenhagen, DK), Conny Aerts (Leuven, BEL), & Tim Bedding
(Univ. of Sydney, AUS).
A part of my work is focused on the main sequence stars: from
solar-like stars and Delta Scuti stars to Beta Cepheid stars. A
number of papers have been
published and more are in preparation. At the moment I am
collaborating with the astrophysics group in Grenada (Suarez, Garrido)
to combine WIRE data with ground-based multi-colour data on Delta Scuti
Stars: Epsilon Cephei, 29 Cygni and Delta Ser.
Eclipsing binaries with WIRE A few new eclipsing
binaries have been discovered with WIRE. We find
that in all systems at least one of the components is variable. We
have initiated an ambitious project to study known detached EBs
systems
that are difficult to study with photometry from the ground. In
collaboration with John Southworth (UK) I have completed papers on
Psi Centauri and Beta Aurigae.
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Curriculum
Vitae
Publications
Preprints
Ph. D.
disseration
Master
Thesis
Research
Work
in progess
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