Published December 12, 2011 | Version v1
Journal article Metadata-only

3-D hydrodynamical model atmospheres: a tool to correct radial velocities and parallaxes for Gaia

Creators

  • 1. Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, B-1050 Bruxelles (Belgium)
  • 2. Université de Nice Sophia-antipolis, CNRS Laboratoire Cassiopée, Observatoire de la Côte d'Azur, B.P. 4229, 06304 Nice Cedex 4 (France)
  • 3. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching b. München (Germany)
  • 4. LUPM, Laboratoire Univers et Particules, Université de Montpellier II, CNRS, Place Eugéne Bataillon, 34095 Montpellier Cedex 05 (France)

Description

Convection plays an essential role in the emerging intensity for many stars that will be observed by Gaia. Convective-related surface structures affect the shape, shift, and asymmetry of absorption lines, the photocentric and photometric variability causing bias in Gaia measurements. Regarding the importance of Gaia mission and its goals, it is mandatory to have the best models of the observed stars. 3-D time-dependent hydrodynamical simulations of surface convection are crucial to model the photosphere of late type stars in a very realistic way. These simulations are an important tool to correct the radial velocities and to better estimate the parallaxes and photometric variability.

Availability note (English)

Available from http://dx.doi.org/10.1088/1742-6596/328/1/012012

Additional details

Identifiers

DOI
10.1088/1742-6596/328/1/012012;

Publishing Information

Journal Title
Journal of Physics. Conference Series (Online)
Journal Volume
328
Journal Issue
1
Journal Page Range
[8 p.]
ISSN
1742-6596

Conference

Title
GREAT-ESF workshop on stellar atmospheres in the Gaia era
Dates
23-24 Jun 2011
Place
Brussels (Belgium)

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
43092285
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ABSORPTION; ASTROPHYSICS; ASYMMETRY; COMPUTERIZED SIMULATION; CONVECTION; HYDRODYNAMICS; PHOTOSPHERE; RADIAL VELOCITY; STAR MODELS; STARS; SURFACES; THREE-DIMENSIONAL CALCULATIONS; TIME DEPENDENCE
Descriptors DEC
ATMOSPHERES; ENERGY TRANSFER; FLUID MECHANICS; HEAT TRANSFER; MASS TRANSFER; MATHEMATICAL MODELS; MECHANICS; PHYSICS; SIMULATION; SOLAR ATMOSPHERE; SORPTION; STELLAR ATMOSPHERES; VELOCITY