Stellar Astrophysics

summer term 2021
Lecturer: Klessen Jordan
Link to LSF
42 participants


Ralf Klessen

ZAH/ITA, Albert-Ueberle-Str. 2, 69120 Heidelberg

Stefan Jordan

ZAH/ARI, Mönchhofstr. 12-14, 69120 Heidelberg


Registration: Please register for the lecture, tutorial group, and chat.



Lecture and tutorials will be held online using zoom. Registered participants receive the access information to the lecture and the tutorial by e-mail. If you have problems send an e-mail to and .



Lecture: Thursdays, 14:00-15:45

Tutorial Group 1: Thursday, 16:00-17:00

Tutorial Group 2: Thursday, 17:00-18:00

Tutorial Group 3: Wednesday, 15:00-16:00


Please submit the homework solutions online at this webpage. The link is found under 'My Groups' (and the selection of the lecture/group). The upload interface offers the possibility to hand in the homework together with other students from the group. The homework solutions need to be handed in by noon on Wednesday the week after they have been issued. 



Lecture content:

Stellar structure and evolution / stellar atmospheres / Sun


Preliminary Schedule:

15.4.21: Introduction (Ralf Klessen)
22.4.21: Stellar structure 1 (Ralf Klessen)
29.4.21: Stellar structure 2 (Ralf Klessen) 
06.5.21: Stellar structure 3 (Ralf Klessen)
13.5.21: Himmelfahrt
20.5.21: Energy transport (Ralf Klessen)
27.5.21: Energy production (Ralf Klessen)
03.6.21: Fronleichnam
10.6.21: Main sequence (Stefan Jordan)
17.6.21: Stellar evolution to the AGB (Stefan Jordan)
24.6.21: Late stages of stellar evolution  (Stefan Jordan)
01.7.21: Stellar pulsations, rotation, magnetic fields  (Stefan Jordan)
08.7.21: Stellar atmospheres stellar spectra  (Stefan Jordan)
15.7.21: Stellar spectra  (Stefan Jordan)
22.7.21: Written exam (at the time of the lecture (14:00-16:00 CEST))
Due to the large number of participants, the seminar will be split in two independent sessions, taking place on Thursday July 29 and on Monday/Tuesday August 2/3. Seminar presentation should be given by teams of two students and will take about 20-25 minutes plus questions. Students in one session should attent all presentations of that session.

Teams and presentations for seminar group 1: July 29:
09:00-09:45 Capecki & Fix : Not all stars form in clusters - Gaia-DR2 uncovers the origin of OB associations
09:45-10:30 Konrad & Kunold: Multiple Populations in Globular Clusters. Lessons learned from the Milky Way globular clusters
10:40-11:25 Hühn & Müller : Mass Loss - Its Effect on the Evolution and Fate of High-Mass Stars
11:25-12:10 Mechler & Vitovsky : Stellar Multiplicity
14:00-14:45 Sattler & Mikosch : The most luminous supernovae
14:45-15:30 Pastor Marcos & Heppe : PreSN Evolution of Massive Single and Binary Stars
15:45-16:30 Heinze & Aberham : Masses, Radii and the EOS of Neutron Stars
16:30-17:15 Bürkle & Roth: Origin of the heavy elements in neutron-star merger

Teams and presentations for seminar group 2: August 2:
09:00-09:45 Kuhlbrodt & Meiners : Formation of the First Stars
09:45-10:30 Sendlinger & Galperin : Magnetars
10:40-11:25 Maas & Covelo Paz : Physical Processes in Magnetically Driven Flares on the Sun, Stars, and Young Stellar Objects
11:25-12:10 Xing & Kavipurapu: The properties of the solar corona and its connection to the solar wind
14:00-14:45 Tschesche & Rosendahl : Ultraluminous X-Ray Sources
14:45-15:30 Choochaow  & Poppe : Atmospheres of brown dwarf
15:45-16:30 Bronner & Cho : Progenitors of Core-Collapse Supernovae
16:30-17:15 Krüger & Wirtz : Origin of Pulsar Radio Emission

Seminar group 2 continued on August 3:
09:00-09:45 Kluge & Herz : The Birth Environment of the Solar System
09:45-10:30 Timmer & Maier : The Ages of Stars
The participants of group 2 need to be present on both days.



Exercise sheets

Stellar Astrophysics
summer term 2021
Klessen Jordan
Link zum LSF
42 participants