Investigating stellar systems is constantly challenged by the intrinsic need to disentangle stellar features and planetary signals. Depending on the planet's position, varying stellar surface areas with changing spectra are covered while orbiting the host star. Accurate models for stellar atmospheres are crucial to attribute signals to the respective celestial bodies correctly. The Sun, the only spatially resolvable star, is an ideal subject to create an atmospheric blueprint for solar-like stars.
At the Institut for Astrophysics and Geophysics in Göttingen, we obtained spatially resolved observations across the solar disc at quiet Sun regions to provide a centre-to-limb solar atlas (R~700,000, lambda 420-800 nm). The spectral lines of the solar spectra experience a convective blueshift for the integrated Sun. We investigated the changing convective blueshift from the disc centre towards the limb (mu = 0.2 - 1.0) for over 1000 Fe I lines. Such observations allow us to compare them with simulated spectra in detail and are, therefore, a useful template to improve atmospheric models.

Seminar held in 538 Davey or please email CEHW-SEMINAR-QUESTIONS@lists.psu.edu to attend virtually.