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Nordic-Baltic Astronomy Days 2026

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

Session

28-C1: Stars

Th-06C
28 May 2026, 13:15
Room C

Room C

Description

Chair: Tiina Liimets

Presentation materials

There are no materials yet.

  1. 322. Measuring Distances to Yellow Super‑ and Hypergiants in the Milky Way
    Anni Kasikov (University of Tartu)
    28/05/2026, 13:15
    Oral

    Yellow Supergiants (YSGs) and Yellow Hypergaints (YHGs) represent brief and unstable phases in the lives of massive stars. They provide a link between the Red Supergiant and evolved Blue Supergiant stages, but their evolutionary pathways remain poorly constrained. Some luminous yellow stars have also been identified as Supernova progenitors. Accurate stellar parameters for YSGs and YHGs in the...

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  2. 323. Photometric and spectroscopic variability of the BSG rhoLeo
    Vitalii Checha (Tartu Observatory)
    28/05/2026, 13:30
    Oral

    The post-main-sequence evolution of massive stars remains a challenging area of study, with many aspects still poorly understood. By investigating the pulsational behavior of evolved massive blue supergiants (BSGs), which hold place in instability region at the top of the HR diagram, we can
    gain insights into their internal structure and verify existing evolutionary models. We combine various...

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  3. 324. Infra-red Nebulae around Symbiotic Binaries
    Havva Bostan (University of Tartu)
    28/05/2026, 13:45
    Oral

    Symbiotic stars (SySts) are interacting binary systems composed of a cold, dust-producing red giant, losing material to a hot white dwarf (WD), and embedded in a surrounding nebula as a result. Interactions between the stellar components, such as mass transfer via Bondi–Hoyle–Lyttleton accretion or Roche-lobe overflow, can trigger outbursts, jet formation, and nova-like explosions. Such events...

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  4. 325. Unveiling binary populations of hot subdwarfs with Gaia spectra and machine learning
    Markus Ambrosch (Vilnius University)
    28/05/2026, 14:00
    Oral

    Hot subdwarfs are compact, core helium-burning stars located on or near the extreme horizontal branch, with temperatures of 20,000–50,000 K and very thin hydrogen envelopes. They are widely regarded as products of binary interaction and are important contributors to the ultraviolet emission of old stellar populations. In this talk, we present our classification of 20,061 hot subdwarfs into...

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  5. 326. Time dependent synthetic observables of 3D models of AGB stars and dusty winds
    Joachim Wiegert (Uppsala university)
    28/05/2026, 14:15
    Oral

    The asymptotic giant branch (AGB) is a late evolutionary stage of stars with masses between 0.8-8 solar masses. AGB stars have grown to radii of around 300 times their original sizes, have non-spherically symmetric surfaces, immense convection zones, and strong dust-driven winds that are initiated when dense dust clouds form in regions close to the stellar surface. These winds are important...

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