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Category/Subcategory: Natural Sciences/Astronomy

Suppression of kinematic dynamo by shear flow

Author: Aditi Sood
Magnetic fields and shear flows play an important role in many systems including astrophysical, geophysical and laboratory plasmas. We report how the growth of magnetic fields is modified by large-scale shear flow by investiga ... more

Views: 377

Introducing SISMA, the HARPS archive of the CoRoT asteroseismic targets

Author: Ennio Poretti
The online archive SISMA (Spectroscopic Indicators in a SeisMic Archive) was created in the framework of the SpaceInn project, with the goal of providing to the scientific community the results of the CoRoT ground-based asterosei ... more

Views: 291

Exploitation of Space Data for Innovative Helio- and Asteroseismology - SpaceInn

Author: Markus Roth
The European Helio- and Asteroseismology Network (HELAS) has initiated the follow-up project "SpaceInn - Exploitation of Space Data for Innovative Helio- and Asteroseismolgoy" with the mission to build on the existing European str ... more

Views: 584

ON POSSIBLE EXPLANATIONS OF PULSATIONS IN MAIA STARS

Author: Jadwiga Daszynska-Daszkiewicz
The long-time photometric surveys in a few young open clusters allowed to identify the light variability in stars located between the well defined  Scuti variables and Slowly Pulsating B-type stars (Mowlavi et al, 2013, 2015). ... more

Views: 356

Radial mode widths in red giant star spectra observed by Kepler

Author: Mathieu Vrard
The Kepler space mission has observed many solar-like pulsators, and helped to decipher their main characteristics (e.g: mass, radius, rotation). Most of the achievements recently obtained in that domain consist of the analysis of ... more

Views: 186

Observations of Red Giants with SONG

Author: Pere L. Pallé
One of the outstanding and unforeseen results from the Kepler mission is our new insight and understanding of red giant stars. These highly evolved stars, which are in the last stages of their life, provide extremely useful inform ... more

Views: 357

Filaments data since 1919: A basis for statistics

Author: Jean Aboudarham
From 1919 to 2002, Paris-Meudon Observatory published synoptic maps of the Solar activity. Together with maps, tables were provided, containing some information concerning at least filaments. The board of Paris Observatory funded ... more

Views: 391

The Early Local Universe – Inside and Outside the Stars

Author: Birgitta Nordstrom
Extremely metal-poor (EMP) halo stars with [Fe/H] below ~ -3 are considered to be fossil records of conditions in the early halo. In the naïve picture in which iron is a proxy for overall metallicity and indirectly for time, EMP ... more

Views: 474

Measurements of helioseismic travel times

Author: Markus Roth
In time-distance helioseismology wave travel times are measured from the cross-correlation between Doppler velocities recorded at any two locations on the solar surface. All local helioseismology inferences rely critically on the ... more

Views: 391

Looking for Magnetic Field in Kepler Red Giants

Author: Jérôme Ballot
Spectropolarimetric measurements allow us to detect and measure magnetic field through Zeeman effect in stellar photospheres. We observed with the spectropolarimeters Narval (at Telescope Bernard Lyot) and ESPADONS (at CFHT) a few ... more

Views: 374