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Institut für Astronomie und Astrophysik

Abteilung Astronomie

Sand 1, D-72076 Tübingen, Germany
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The scientific main interest of our telescope group is the determination of orbital periods of binary systems, especially of cataclysmic variables. These are close binary systems in which matter from one star (donor) flows to the other star (accretor). Normally an accretion disk is built around the accretor. These systems show many astrophysical phenomena which often lead to a variability of their light curve. One observes for example nova outbursts (thermonuclear explosions on the surface of the accretor) and dwarf nova outbursts (strong increase of the temperature and luminosity of the accretion disk) or variable mass transfer from the donor onto the accretor.

Furthermore we try to determine pulsation periods of pulsating stars. From those pulsation periods one can learn much about the inner structure of the star (asteroseismology).

The basis for the determination of orbital and pulsation periods is the generation of the light curve of an object. During the night, or several nights, one takes exposures of the object and determines the brightness of the object in every single exposure, dependent on the time, to get the light curve. This light curve is analysed with software packages, developed at our institute, to detect periodic variabilities.

Finished Campaigns

dateobjectprogramscientific output
may/june 2009gaseous nebulaespectroscopy of gaseous nebulae within a lecturespectra are in the gallery
may 2009WET XCov 27pulsation periods 
february 2009spectroscopy and photometryadvanced lab 
october/november 2008 photometry moonpart of diploma thesis 
september/october 2008 GD29-38WET-campaign, pulsation periodsPaper in prep.
july 2008spectroscopy and photometryadvanced lab 
may 2008 HE1429-1209looking for further pulsation periodsPaper in prep.
february 2008 HS0702+6043pulsation periodslong-term project
february 2008spectroscopy and photometryadvanced lab 
december 2007sdB starspulsation periodslong-term project
september/october 2007SDSS J212531.92-010745.9orbital period A new period determination for the close PG1159 binary SDSS J212531.92-010745.9
Schuh, S.; Traulsen, I.; Nagel, T. et al. 2008, AN, 329, 376S
july 2007spectroscopy and photometryadvanced lab 
june/july 2007gaseous nebulaespectroscopy of gaseous nebulae within a lecturespectra are in the gallery
april/may 2007HE1429-1209looking for further pulsation periodsPaper in prep.
february 2007spectroscopy and photometryadvanced lab 
dec. 2006HS0444+0453 looking for pulsation periodsnothing found
dec. 2006HS0704+6153 looking for pulsation periodsnothing found
dec. 2006EQ Peg looking for flaresService for Uni Göttingen
sept.+oct. 2006SDSS J212531.92-010745.9orbital period higher accuracy of period and amplitude
aug. 2006CSPN NGC7094 pulsation periodsnothing found
july 2006spectroscopy and photometryadvanced lab 
may+june 2006 GD358WET XCov25:
pulsation periods
Whole Earth Telescope Observations Of GD358: A New Look At The Prototype DBV
february 2006spectroscopy and photometryadvanced lab 
sept. 2005SDSS J212531.92-010745.9orbital period Plots

discovery of the first definite PG1159 close binary system
Nagel, T., Schuh, S. et al. 2006, A&A, 448, L25
july+aug. 2005RX J1940.1-1025orbital period not yet
july 2005spectroscopy and photometryadvanced lab 
march 2005SS UMiorbital periodclassified
february 2005spectroscopy and photometryadvanced lab 
july+aug. 2004RX J1940.1-1025orbital period Plots
may 2004HE1429-1209pulsation period Plots

Discovery of stellar pulsations in the new identified PG1159 star HE1429-1209
Nagel, T. & Werner, K. 2004, A & A, 426, p.L45-L48
feb. 2004HS0702+6043pulsation periodPlots

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Last modified 10 Aug 2009
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