Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt.........1t&link_type=abstract
PhD Thesis, Naturwissenschaftlich-Mathematische Gesamtfakultät der Universität Heidelberg, Germany. X+112 p. (2001)
Physics
Eclipsing Binaries, P Cygni Stars, Magellanic Clouds
Scientific paper
The eclipsing P Cygni Star R81 (HDE 269128, HIP 24080) of spectral type B2.5 Ia-0 in the Large Magellanic Cloud was studied on the basis of a long continuous timeseries with simultaneous high resolution FEROS spectra and photometric measurments in the Stroemgren system. The orbital period of the binary is 74.566 days. The mean lightcurve shows two eclipses, a brightness maximum just after the eclipse of the hypergiant and a slow decline of brightness between the two minima. A spectral signature of the companion of the hypergiant has not been found. A model was used to fit the radial velocity of the hot component and the lightcurve including both stars, a disk around the companion and a hot spot on the rim of the disk. Except for the brightness maximum the lightcure could be reproduced by the model. The companion is completely shrouded by the disk. However, the physical cause of the hot spot is not clear due to its position. The masses of the hypergiant and its companion were determined to M1 = 15 Msolar and M2 = 4 Msolar respectively. However, these absolute values have to be considered preliminary due to the questioned validity of the model. The system is close and eccentric (e = 0.405). Both components nearly fill their Roche volumes. In addition to signs of mass overflow or outflow, line profile variations with a period of 10.98 days, probably caused by nonradial pulsation were observed.
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