Login

Nordic-Baltic Astronomy Days 2026

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

Session

27-A2: Stars

We-08A
27 May 2026, 15:00
Room A

Room A

Description

Chair: Oleg Kochukhov

Presentation materials

There are no materials yet.

  1. 279. Twinkle twinkle little star, can I know how old you are?
    Emelie Sandved (Uppsala University, Department of Physics and Astronomy, Division of Astronomy and Space Physics)
    27/05/2026, 15:00
    Oral

    Knowing ages of stars is essential for many fields in astronomy where we want to study the evolution of different astronomical systems. Examples of such fields are planet system evolution, planetary evolution, and galactic archaeology. However, estimating the age of a star is not as straightforward as one might think. In fact, stars undergo very few evolutionary stages where their observed...

    Go to contribution page
  2. 280. Search for stellar remnant candidates using microlensing events from Gaia
    Uliana Pylypenko (Finnish Centre for Astronomy with ESO (FINCA); University of Turku)
    27/05/2026, 15:15
    Oral

    Microlensing provides a unique way to detect and constrain the masses of isolated, non-luminous objects, including dark stellar remnants. Under favorable conditions, lens masses can be measured using photometric data alone, typically through the detection of finite-source (FS) effects in highly magnified events.

    I will present unusual microlensing events identified in Gaia Alerts and Gaia...

    Go to contribution page
  3. 281. Characterization of White Dwarfs with Noisy Spectra
    Sicheng Yu
    27/05/2026, 15:30
    Oral

    The population of known white dwarfs (WDs) has expanded rapidly with Gaia observations, the number of WDs and their candidates have exceeded beyond one million. High-resolution surveys like the ESO SN Ia Progenitor Survey (SPY) provided gold-standard parameters for ~1,000 WDs using UVES/VLT spectra. However, precious observations with such precision and high resolution are not meant for the...

    Go to contribution page
  4. 282. Evolutionary status of WZ Sge
    Paula Kvist (University of Oulu)
    27/05/2026, 15:45
    Oral

    Cataclysmic variables (CVs) are a type of interacting binary stars with a white dwarf primary and a low-mass donor star. In weakly magnetic systems, an accretion disk is formed around the primary star. Current evolutionary models predict the orbital period of CVs to shorten, until the donor has lost enough mass to become a degenerate brown dwarf. This happens at orbital periods of around...

    Go to contribution page
  5. 283. System parameters and long-term evolution of the WZ Sge-type dwarf nova V627 Pegasi
    Veera Vuolteenaho (University of Oulu)
    27/05/2026, 16:00
    Oral

    We present a detailed study of V627 Pegasi, a short-period dwarf nova of the WZ Sge-type exhibiting some peculiar behavior. Our analysis is based on multi-epoch time-resolved spectroscopy complemented by photometric observations. The dataset includes observations from the Hubble Space Telescope, the Very Large Telescope of the European Southern Observatory, and the Nordic Optical Telescope....

    Go to contribution page
Building timetable...