High-resolution spectroscopy of 31 Pegasi. The Hγ and He I 4471 line variations.

Bibcode
1996A&A...308..852Z
Zorec, J.; Israelian, G.; Ballereau, D.; Chauville, J.
Referencia bibliográfica

Astronomy and Astrophysics, v.308, p.852-862

Fecha de publicación:
4
1996
Revista
Astronomy and Astrophysics
Número de autores
4
Número de autores del IAC
0
Número de citas
5
Número de citas referidas
5
Descripción
We present high-resolution He I 4471, Mg II 4481 and Hγ line profiles of the Be star 31 Peg obtained simultaneously at four observing dates. In this paper we focus on the He I 4471 line and on the absorption wings of the Hγ line which showed important variations. Models of static stellar atmospheres were calculated to determine the photospheric parameters of the underlying star. However, non-static and out of radiative equilibrium models are needed to better understand the structure of the atmosphere of 31 Peg and the characteristics of the observed He I 4471 and Hγ lines. The implication of deep atmospheric layers in the mass-loss phenomena of Be stars is suggested.
Tipo
Con árbitro

Te puede interesar

  • Con árbitro
    Radial gradients of CO absorptions and abundance ratios in the bulge of M31
    We present new H- and K-band spectroscopy for the bulge of M31, taken with the LUCI spectrograph at the Large Binocular Telescope (LBT). We studied radial trends of CO absorption features (namely, CO1.58, CO1.60, CO1.64, CO1.66, CO1.68, CO2.30, CO2.32, and CO2.35) in the bulge of M31, out to a galactocentric distance of ∼100″ (∼380 pc). We find
    La Barbera, F. et al.

    Fecha de publicación:

    7
    2024
    Bibcode
    2024A&A...687A.156L
    Número de citas
    0
  • Con árbitro
    A 20 kiloparsec bipolar Lyman α outflow from a radio galaxy at z = 2.95
    The study of ionized gas kinematics in high-z active galaxies plays a key part in our understanding of galactic evolution, in an age where nuclear activity was widespread and star formation close to its peak. We present a study of TXS 0952−217, a radio galaxy at z = 2.95, using VLT/MUSE integral field optical spectroscopy as part of a project aimed
    Coloma Puga, M. et al.

    Fecha de publicación:

    6
    2024
    Bibcode
    2024A&A...686A.220C
    Número de citas
    0
  • Con árbitro
    Chronology of our Galaxy from Gaia colour-magnitude diagram fitting (ChronoGal). I. The formation and evolution of the thin disc from the Gaia Catalogue of Nearby Stars
    Context. The study of the Milky Way is living a golden era thanks to the enormous high-quality datasets delivered by Gaia, and space asteroseismic and ground-based spectroscopic surveys. However, the current major challenge to reconstructing the chronology of the Milky Way is the difficulty to derive precise stellar ages for large samples of stars
    Gallart, Carme et al.

    Fecha de publicación:

    7
    2024
    Bibcode
    2024A&A...687A.168G
    Número de citas
    0