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Stellar evolution along the HR diagram with Gaia

19–23 Sept 2022
INAF-Osservatorio Astronomico di Capodimonte
Europe/Rome timezone

LOC

Session

White dwarfs - Asteroseismology - Binaries

22 Sept 2022, 09:00

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  1. 64. Understanding binary stars with Gaia (Invited)
    R. Izzard
    22/09/2022, 09:00

    Binary stars are vital to most of astrophysics. Both historically and still today they provide key measurements of stellar masses and radii. Many binaries interact, hence transfer and lose mass and angular momentum leading to the formation of exotic stars like blue stragglers, R-type carbon stars, Wolf-Rayet stars and barium/CH/CEMP stars, and also unique phenomena such as novae, X-ray...

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  2. 65. White dwarf cosmochronology (Invited)
    J. Isern
    22/09/2022, 09:30

    The evolution of white dwarfs is a gravothermal process of cooling that allows them to be be used for reconstructing or at least for constraining the evolution of several Galactic populations of stars. At present, the number of white dwarfs with reasonably good parallaxes and photometric data is ~300,000 thanks to the Gaia mission. These data together with the spectroscopic information...

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  3. 66. Accurate masses of Hyades White Dwarfs
    L. Pasquini
    22/09/2022, 10:00

    Accurate measurements of white dwarfs masses are needed for determining the amount of gas recycled in the Galaxy, and, when measured through gravitational
    redshift, establish a firm comparison between quantum mechanics and general relativity predictions.
    We use the accurate ESPRESSO spectrograph at the VLT to determine Doppler shifts and gravitational redshifts for 8 bona fide Hyades white...

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  4. 67. Seismic cartography of white-dwarf interiors: how well can we constrain convective mixing?
    N. Giammichele
    22/09/2022, 10:20

    Probing internal properties of white-dwarf stars has been amongst the earliest objectives of asteroseismology. White-dwarf pulsators offer exciting opportunities to unravel their inner structure and dynamics from the observed low-degree, low-order gravity (g-)modes. We review the most recent efforts from our group to perform a complete seismic cartography of white-dwarf interiors of DB and DA...

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