Stellar Astrophysics

summer term 2023
Lecturer: Stefan Jordan, Ralf Klessen
Link to LSF
30 participants


Stefan Jordan

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

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


Registration: Please register for the tutorial group (Exercise group 1 or 2).


Location: The lecture and the tutorials will be held in person in the Kleiner Hörsaal, Philosophenweg 12. 


Lecture: Thursdays, 14:00-15:45

Tutorial Group 1: Thursday, 15:45-16:45 (Maltsev, Jordan)

Tutorial Group 2: Thursday, 16:45-17:45 (Martsev, Jordan)


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. 


Please comply with the current COVID regulations!


Lecture content: Stellar structure and evolution / stellar atmospheres / Sun


Preliminary Schedule:

20.4.23: Introduction & basic equations (Ralf Klessen)

27.4.23: Stellar structure equations (Ralf Klessen)

04.5.23: Timescales & virial balance (Ralf Klessen)

11.5.23: Equation-of-state (Ralf Klessen)

18.5.23: Himmelfahrt

25.5.23: Polytropic models (Ralf Klessen)

01.6.23: Energy transport (Stefan Jordan)

08.6.23: Fronleichnam

15.6.23: Energy production  (Stefan Jordan)

22.6.23: Main sequence (Stefan Jordan)

29.6.23: Stellar evolution to the AGB (Stefan Jordan)

06.7.23: Rotation, magnetic fields, stellar pulsations, (Stefan Jordan)

13.7.23: Late stages of stellar evolution(Stefan Jordan)

20.7.23: Stellar spectra (Stefan Jordan)

27.7.23: 10:00-12:00 CEST, written exam in the "Neuer Hörsaal", Philosophenweg 12, 



Time: 3 full days (July 31, August 1 and 2, 2023)

Location: Seminar Room 105, Philosophenweg 12

Time: 9:30-12.30 CEST, 14:00-17:00 CEST


This is the list of potential papers for the seminar:


To submit your top three preferences, please send an email to Please be aware that only students who have met the module requirements are eligible to participate. However, there is an exception for PhD students who are not required to attend the tutorials but may voluntarily present a seminar talk without receiving credit points.

Please be aware that there are some  papers that address the same topic. If you select one of these papers, you will be asked to consider the related paper as well.
If you choose a review paper, you are not required to cover all the different aspects discussed in the paper during your seminar talk. Instead, choose a few aspects that you can focus on.
The length of your talk will be  35 minutes. Following your talk, there will be an opportunity for questions and feedback.
You have to be present on all three days of the seminar!
Preliminary List of topics and participants: 

Valentin Oettinger: Atmospheres of Brown Dwarfs

Paula Pérez Rickert: The Birth Environment of the Solar System

Max Schmidt: Solar Dynamo Theory

Daniel Rodener: Giant white-light flares on fully convective stars occur at high latitudes

Lutz Hrdlicka: Building and maintaining a solar tachocline

Kolja Reuter: The Properties of the Solar Corona and its connection to Solar Winds

Daniel Schmidt: Solar Neutrinos: Status and Prospects

Vijayalakshmi Nair: Multiple Stellar Population in Globular Clusters

Jonas Reichert: Giant star seismology

Kenan Özkoc: New Insights into the Evolution of Massive Stars and Their Effects on Our Understanding of Early Galaxies

Oliver Avril: High-precision stellar abundances of the elements

Tom Schiwy: Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3

Julian Saling: MESA Models with Magnetic Braking

Ema Zavodnik: Core crystallization and pile-up in the cooling sequence of evolving white dwarfs

Nikhil Kurup: Pulsating White Dwarfs: New Insights

Finn Mahnken: The Most Luminous Supernovae

Wing Hong Hung: Origin of the heavy elements in binary neutron-star mergers from a gravitational-wave event

Sara Kutschbach: The Assembly of the First Massive Black Holes


Exercise sheets

Practice groups

Stellar Astrophysics
summer term 2023
Stefan Jordan, Ralf Klessen
Link zum LSF
30 participants