Friday, August 19, 2016

Researchers at the UW made a breakthrough discovery. He appreciated the prestigious magazine “Nature” – Gazeta Wyborcza

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What is the discovery scientists from UW? Astronomers after analyzing data from several years confirmed the so-called. theory hibernation novae. The authors work in “Nature” describes the long-term observations of the star V1213 Centauri (Nova Centauri 2009), which broke 8 May 2009. It is located in the constellation Centaurus in within 23 thousand light-years from Earth. Data were collected using 1.3-m telescope at the Warsaw station UW located in the Las Campanas Observatory in Chile. Observations made in the review of the sky The Optical Gravitational Lensing Experiment (OGLE) cover a period of several years before the explosion and beyond. The outbreak of the new 2009. Was discovered during another sky survey All Sky Automated Survey, also conducted at the Astronomical Observatory of the University of Warsaw.

– novae explosions are among the most stellar explosions observed in the Universe. Within a few hours of the new shine more than several thousand times, becoming one of the brightest objects in the galaxy – says Przemysław Frost, the first author of the publication in the journal “Nature”, a doctoral student from Warsaw University Astronomical Observatory.

theory hibernation, scientists from the UW

One of the hypotheses that describe the behavior of novae between bursts is the theory of hibernation, according to which tens-hundreds of years after the outbreak of the new system should be in a state of low activity (called “hibernation”) when the mass flow virtually ceases. According to this hypothesis thermonuclear fusion on the surface of the white dwarf, and consequently – very strong lighting companion, it affects its structure. Neighbor white dwarf swells and loses matter at a much faster pace. The gas flow stops after a few hundred years, when the lighting will decrease significantly.

One of the arguments in favor of the theory of hibernation was the discovery of a very weak halos around two systems with low activity – remnants of the explosions of new thousands of years ago. However, it has failed to observe directly, as new explosions affect the properties of the stars in the system and the rate of flow of matter.

After years of research and data analysis theory of scientists from the UW is confirmed. – Our observations are consistent with the predictions of theory hibernation. For the first time we could so accurately trace the evolution of new before the explosion and after – says Przemysław Frost.

More information about the work of astronomers from the University of Warsaw can be found at the university.

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