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Nordic-Baltic Astronomy Days 2026

26–29 May 2026
Radisson Blu Marina Palace Hotel
Europe/Helsinki timezone

Session

27-A3: Stars

We-10A
27 May 2026, 16:45
Room A

Room A

Description

Chair: Šarūnas Mikolaitis

Presentation materials

There are no materials yet.

  1. 294. Mapping stellar active regions based on photometry
    Mikko Tuomi (University of Helsinki)
    27/05/2026, 16:45
    Oral

    Obtaining detailed information on the active regions, i.e. spots, on stellar surfaces based on photometry is challenging. This is because retrieving two-dimensional information based on one-dimensional time-series data corresponds to an ill-posed inverse problem.

    However, there are ways around the ill-posedness and it is possible to study stellar spot configurations in detail in a variety...

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  2. 295. Looking Inside Stars: Asteroseismology of Solar-Type Stars
    Hans Kjeldsen (Instrument Centre for Danish Astrophysics, Aarhus University, Denmark)
    27/05/2026, 17:00
    Oral

    Asteroseismology is the study of oscillations in stars. Stars can sustain standing waves, meaning that the star is oscillating. These oscillations can be excited by different mechanisms. The opacity mechanism, acting in ionization zones, converts thermal energy into mechanical oscillations, whereas solar-like oscillations are stochastically excited and damped by turbulent convection in the...

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  3. 296. Towards a unified observational view of cool-star magnetism
    Prof. Oleg Kochukhov (Uppsala University)
    27/05/2026, 17:15
    Oral

    The surface magnetic fields of cool stars are inherently multi-scale, dominated by small-scale structures while also hosting weaker large-scale components. Historically, these two aspects of stellar magnetism have been studied in isolation, using distinct diagnostic techniques—Zeeman broadening for small-scale fields and spectropolarimetry for large-scale fields. This separation has led to a...

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  4. 297. Magnetic activity biases in asteroseismic inferences: challenges for stellar age diagnostics in the PLATO era
    Jérôme Bétrisey (Uppsala University)
    27/05/2026, 17:30
    Oral

    Following the success of missions like CoRoT, Kepler, and TESS, asteroseismic modelling is poised to play a key role in upcoming space-based missions such as PLATO, CubeSpec, and Roman. Despite remarkable achievements, the era of high-precision asteroseismology has also revealed significant discrepancies between observed data and theoretical stellar models, leading to non-negligible biases...

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  5. 298. Testing the reliability of magnetic field strength measurements for M dwarfs
    Irene Amateis (Uppsala University)
    27/05/2026, 17:45
    Oral

    M dwarfs are the most common stars in the Galaxy and prime targets in the search for potentially habitable exoplanets. Their strong magnetic fields shape stellar atmospheres, drive winds, and critically influence the environments of orbiting planets. A reliable characterisation of these fields is therefore essential for both stellar astrophysics and planetary habitability studies.
    We...

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  6. 299. Starspots on eclipsing giant stars
    Andras Haris (University of Helsinki)
    27/05/2026, 18:00
    Oral

    Eclipsing binaries with a spotted giant component are exceptional laboratories for the study of stellar magnetism. Although magnetic activity in such systems has long been recognised, detailed photometric analyses were historically limited by incomplete ground based data. High precision space photometry now enables eclipse mapping, a technique which allows us to infer starspot properties from...

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