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Digitala Astronomdagarna 2021

Oct 21 – 22, 2021
Zoom
Europe/Zurich timezone

Session

Stars

5
Oct 22, 2021, 10:45 AM
Zoom

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Conveners

Stars

  • Gasper Kukec Mezek (Linnaeus University)

Presentation materials

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  1. 28. Physical properties of a Fan-Shaped jet backlit by an X9.3 flare
    Alexander Pietrow (Stockholm University)
    10/22/21, 10:45 AM
    Talk

    Fan-shaped jets can be observed above light bridges and are driven by reconnection of the vertical umbral field with the more horizontal field above the light bridges. Because these jets are not fully opaque in chromospheric lines, one cannot study their spectra without the highly complex considerations of radiative transfer in spectral lines from the atmosphere behind the fan.

    We take...

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  2. 3. Clues to galaxy evolution from chemical abundances of stars in the Galactic centre
    Brian Thorsbro (Lund University)
    10/22/21, 10:55 AM
    Talk

    We present a detailed study of the composition of 20 M giants in the Galactic center with 15 of them confirmed to be in the nuclear star cluster. As a control sample we have also observed 7 M giants in the Milky Way disk with similar stellar parameters. All 27 stars are observed using the NIRSPEC spectrograph on the KECK II telescope in the K-band at a resolving power of R=23,000. We report...

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  3. 19. Model grids of C-type AGB stars and the effect of dust opacities on wind properties
    Emelie Siderud (Uppsala University)
    10/22/21, 11:05 AM
    Poster

    Stars on the asymptotic giant branch (AGB) lose a substantial part of their mass through stellar winds. Pulsations induce shock waves throughout the stellar atmosphere which compresses and elevates gas to cooler regions where dust can form. The newly formed dust particles are accelerated outwards by radiation pressure, dragging gas along, resulting in a wind. Dynamical atmosphere and wind...

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  4. 25. Non-LTE effects in M dwarfs
    Ms Terese Olander (Uppsala Universitet)
    10/22/21, 11:15 AM
    Poster

    M dwarfs have become an increasingly interesting target in the search for exoplanets. This is due to their small radii and low temperature which makes finding planets via both radial and transit methods easier. M dwarfs are however know to be tricky targets. The best option we have to characterise their atmospheres is using spectroscopy. This is not an easy task. M dwarf spectra are filled...

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  5. 2. Probing neutron star magnetic fields using X-ray polarimetry
    Nirmal Kumar Iyer (KTH)
    10/22/21, 11:25 AM
    Talk

    X-ray polarisation is set to open a new window into highly energetic astronomical sources like neutron stars and black holes. The upcoming launches of IXPE (a satellite-based soft X-ray polarimeter) in late 2021 and XL-Calibur (a balloon-borne hard X-ray polarimeter) in 2022 will soon provide sensitive X-ray polarisation measurements. These measurements can be used to study the strong magnetic...

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  6. 5. Magnetic fields of binary stars
    Axel Hahlin (Uppsala University)
    10/22/21, 11:35 AM
    Talk

    Investigation of the magnetic fields on stars is important because they affect many different properties of stars at multiple stages of their evolution. The magnetic field is also a key component in the interaction between the star and its surroundings, possibly affecting habitability. The study of binaries offers a unique opportunity due to the fact that the formation of the components are...

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