{"id":597,"date":"2021-08-13T14:16:39","date_gmt":"2021-08-13T12:16:39","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/en\/?page_id=597"},"modified":"2022-05-04T12:00:02","modified_gmt":"2022-05-04T10:00:02","slug":"workshop-2021","status":"publish","type":"page","link":"https:\/\/stel.asu.cas.cz\/en\/seminars\/workshops\/workshop-2021\/","title":{"rendered":"Workshop 2021"},"content":{"rendered":"\n

Workshop on observational techniques<\/mark><\/h2>\n\n\n\n

6-17 September 2021 at Ond\u0159ejov observatory<\/span><\/strong><\/h4>\n\n\n\n
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Overview <\/mark><\/h4>\n\n\n\n

Looking into astronomy textbooks, the evolution of stars seems to be well understood. However, this is a misconception, because some phases of stellar evolution are in fact hardly understood at all. The problem becomes even more severe, as soon as stars evolve in binary systems, which is by no means an exception but rather the rule. Mass transfer, either stable or unstable, can alter stellar evolution and even form objects, which cannot be understood in any other way. In particular the region of the hot subluminous stars remains as uncharted territory despite the fact that no less than 97% of all stars are evolving through this region.<\/p>\n

As soon as stars like our Sun run out of fuel in their cores and the fusion of hydrogen stops, they expand and become red giants with radii up to a hundred times larger than before. The expansion stops when helium fusion starts in the core. In this short phase the star not only shrinks and becomes hotter, it also loses a large amount of mass, either due to strong stellar winds or by mass transfer to a close companion star. The outcome are stars significantly smaller and hotter than the Sun, which we call hot subluminous stars.<\/p>\n\n\n\n

Scope of the Workshop<\/strong><\/mark><\/h5>\n\n\n\n

In this research workshop we want to study this transition phase between red giants and hot subluminous stars in more detail, especially focusing on the role of binary interactions in the process. Using the telescopes at Ondrejov, we will observe samples of red giants and hot subluminous stars and systematically search for binary systems.

The students will be trained by members of the Stellar Astrophysics Group in Potsdam<\/a> led by Dr. Veronika Schaffenroth and Prof. Stephan Geier and members of the Stellar Physics Department of AS CZ<\/a> in Ondrejov. The workshop will consist of lectures and practical exercises, and aims at teaching the students how to prepare and conduct an observing run, how to select targets using datamining techniques, and how to process and analyse the observational data. The students will also have opportunity to observe with the Perek 2-m and the Mayer 65-cm telescopes. Furthermore, the students will learn about the astrophysical background of the project.

Besides gaining unique expertise in observational astrophysics, they will also have the opportunity to significantly contribute to ongoing science projects and to become true members of our team.<\/p>\n\n\n\n

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Organization<\/mark><\/h4>\n\n\n\n

Scientific Organizing Committee (SOC)<\/strong><\/p>\n\n\n\n